Chemical yields from low- and intermediate-mass stars model predictions and basic observati

Fundamentals of Forest Products Chemical Processing 林产化工专业英语智慧树知到课后章节答案2023年下东北林业大学东北林业大学绪论单元测试1.Generally, gum rosin is produced by chemical processing of woody rawmaterial.A:对 B:错答案:错第一章测试1.Trace elements are essential to life.A:错 B:对答案:对2.Elements with similar chemical properties generally fall into the same groupin the periodic table.A:错 B:对答案:对3. A pure substance always has the same physical and chemical properties andis either an element or a compound.A:错 B:对答案:对4.Calcium oxide is an inorganic compounds.A:错 B:对答案:对5.Any chemical species capable of binding to electron pairs is called a Lewisacid; any molecule that tends to donate an electron pair is referred to as a Lewis base.A:错 B:对答案:对6.In either case, the position of the multiple bond is indicated by numberingfrom the end of the chain, starting at the end that will assign the lowernumber to the first carbon atom of the multiple bond.A:错 B:对答案:对7.Ethers tend to be reactive, and low molecular mass ethers are often used assolvents.A:对 B:错答案:错8.If one or both of the hydrogen atoms on the amide nitrogen atom arereplaced by hydrocarbon groups, the structure is named as an N-substituted amide.A:对 B:错答案:对9.By doing research in chemistry, we can find new cures for diseases as well asbetter chemicals to use in our natural environment.A:错 B:对答案:对第二章测试1.We can eat or drink in laboratoriesA:对 B:错答案:错2.If a liquid gets into your eyes, the eye should be washed immediately withclean running water for at least 10min.A:对 B:错答案:对3.In the case of fire alarm, we need stop all of your ongoing work, turn off gasand electric devices.A:错 B:对答案:对4.There is no need to label glass or flask filled with solution.A:错 B:对答案:错5.If you work with flammable solvent, make sure there is no source of ignitionclose by.A:对 B:错答案:对第三章测试1.Fossilised biomass has been exploited as coal and oil.A:对 B:错答案:对2.The relative distribution of phenolic nuclei in lignin strongly differs betweenplant species.A:对 B:错答案:对3.The role of hemicellulose is to modify and crosslink the basic fibrils andpromote the interaction between other biopolymers.A:错 B:对答案:对4.Softwoods are mainly vessel members, fibres, and parenchyma, andhardwoods are mainly made of made of tracheids and parenchyma.A:错 B:对答案:对5.The outer layer (S1) is thicker than The middle layer (S2).A:对 B:错答案:错6.Klason lignin is a standard analytical method to measure the lignin contentof lignocellulosic biomass.A:对 B:错答案:对7.For esterification reaction of cellulose, the conversion was low and forsilynation reaction, the conversion is good but with a high cost.A:错 B:对答案:对8.Cellulose has many hydroxyl groups which can form hydrogen bondinglinked network easily.A:错 B:对答案:对9.Highly porous aerogels usually tend to show higher oil-sorption capacitiesA:错 B:对答案:对10.Starch only has one forms, i.e. amylose.A:错 B:对答案:错11.In addition to glucomannan, minor amounts of miscellaneouspolysaccharides are present in hardwoods.A:对 B:错答案:错12.The softening temperature (Ts) of lignins in dry state is higher than that inmoist lignins.A:对 B:错答案:对13.The reactivity of lignin has nothing to do with its solubility.A:错 B:对答案:错14.Lignin mainly has two types of linkages including C-C and C-O-C.A:对 B:错答案:对15.The non-bonded orbital interactions (π-π interactions) of the aromaticgroups could caused the association of lignin molecules.A:错 B:对答案:对16.The aromatic moieties present in the lignin structure will improve themechanical and thermal properties of epoxy resins.A:对 B:错答案:对17.There are two different types of polysaccharide hydrolysis, involving acidic(sulfuric acid) or enzymatic reactions.A:错 B:对答案:对18.Terpene is derive from a 5C compound, isoprene.A:对 B:错答案:对19.Polyphenols also characteristically possess a significant binding affinity forproteins, which can lead to the formation of soluble and insoluble protein-polyphenol complexesA:错 B:对答案:对20.Cardanol double bond may be epoxidised or undergo olefin-metathesisreaction which may act as modified monomer for the formation of different set of polymers.A:错 B:对答案:对第四章测试1.Sodium hydroxide and calcium hydroxide can be used instead of potassiumhydroxide to neutralize the acid.A:对 B:错答案:对2.Hot air blows into this dryer to bring the sugars humidity level down to 0.05percent, that standard for table sugar.A:对 B:错答案:错3.The main resistance to the flow of heat or mass to a surface lies within thelaminar sublayer.A:对 B:错答案:对4.Filter cakes are formed late in the fluid flow.A:错 B:对答案:错5.Extraction may be used to separate more than two components; andmixtures of solvents, instead of a single solvent, are needed in someapplications.A:错 B:对答案:对6.Heat fluxes may then be based either on the inside area or the outside area ofthe choice is arbitrary.A:错 B:对答案:对7.Any evaporator that uses pump to ensure higher circulation velocity is calleda forced circulation evaporator.A:对 B:错答案:对8.If the feed is introduced at one point along the column shell, the column isdivided into an upper section, which is often called the stripping section, anda lower section, which is often referred to as the rectifying section.A:错 B:对答案:错9.Drying is an absolute term that means a certain value.A:对 B:错答案:错第五章测试1.The traditional techniques of solvent extraction of plant materials are mostlybased on the correct choice of solvents and the use of heat or/and agitationto increase the solubility of the desired compounds and improve the masstransfer.A:错 B:对答案:对2.They spray the rubber cubes with a mix of calcium carbonate and solvent themixture forms the film on the cubes that prevents mold and keeps them from sticking together during transport.A:对 B:错答案:对3.Biomass is mostly made up of carbon, hydrogen, compounds did not burncalled ash.A:对 B:错答案:对4.Biochemical approaches include three unit-operations namely, pretreatment,hydrolysis, and distillation.A:对 B:错答案:错5.Furfural can be produced by a one-step or a two-step process. The advantageof the one-step process is that a higher quantity of furfural is produced when compared to the two-step process.A:对 B:错答案:错6. A worm screw supply the mixture to a press roll, a constant spray of waterkeeps the mixture from sticking to it.A:错 B:对答案:对7.Chemical activation is usually carried out at lower temperatures (from 400 to700℃) with activating agents like phosphoric acid, potassium hydroxide,sodium hydroxide and zinc chloride.A:对 B:错答案:对8.Generally, the cellulosic cell wall from nearly any plant or trees can be usedfor pulp.A:错 B:对答案:对9.When the paper is dry it may be treated with stabilizing materials andsurface finishes to improve durability or printability.A:对 B:错答案:对。

小学上册英语第二单元真题试卷(含答案)英语试题一、综合题(本题有100小题，每小题1分，共100分.每小题不选、错误，均不给分)1.Dolphins are very _________ (聪明).2.What is the name of the famous American holiday celebrated on July 4th?A. ThanksgivingB. Independence DayC. Memorial DayD. Labor Day答案: B3. A ______ (海豹) can dive deep into the ocean.4.The chemical formula for silver bromide is _______.5.What is the name of the famous cat in the children's book series by Dr. Seuss?A. GarfieldB. Puss in BootsC. The Cat in the HatD. Tom Cat答案:C6.The butterfly is ________ (美丽).7.What is the chemical symbol for gold?A. AuB. AgC. PbD. Fe答案:A.Au8.The _______ of a sunflower always faces the sun.9.小猴子) swings from branch to branch. The ___10.I can __________ very well.11.We eat breakfast in the ______. (morning)12.My dad teaches me how to ________ (骑自行车) without training wheels. It was hard at first, but now I can do it ________ (很好).13.The __________ is a major river system in Europe. (多瑙河)14.What is the name of the fairy in Peter Pan?A. Tinker BellB. CinderellaC. Snow WhiteD. Ariel答案: A15.The main product of combustion is _______.16.We visit the ______ (天文馆) to learn about space.17.The chemical symbol for osmium is ______.18.The _____ (季节) changes affect how plants grow.19.The process of creating steam from water is called _______.20.I want to learn how to ______ (ski).21.The parrot's beak is strong enough to crack ________________ (坚果).22.I like to go ______ (远足) in the mountains during the summer.23.The __________ (滑雪) resort is popular in winter.24. A _______ is a chemical compound formed from two different elements.25.Listenand circle.(听录音，圈出正确的图片)26.I want to be a _____ (科学家).27.The ______ creates beautiful art.28. A __________ is a chemical change that produces light and heat.29.We have a ______ (精彩的) event planned for next month.30.The garden is full of lovely _______ that make me happy.31.I enjoy ______ (解决) challenges.32.The boiling point of water is ______ degrees Celsius.33.The chemical formula for copper(II) sulfate is ______.34.My dad encourages me to be __________ (积极的).35.My friend is a __________ (技术专家).36.__________ (纳米技术) involves manipulating matter at the molecular level.37.My dad teaches me about __________ (重要的) values in life.38. A desert is a place that receives very little _______.39. A ________ is a fun stuffed animal.40.The __________ is known for its rich biodiversity.41.The kitten loves to play with a ______.42.I love to draw pictures of ______ (植物) and ______ (动物).43.My pet dog loves to go for a _________ (散步).44.I love to drink __________ on a cold day. (热饮)45.I have _____ (two/three) brothers.46. A ______ (生态系统服务) is crucial for human well-being.47.I enjoy watching ________ in the garden.48.I like to _____ (学习) about different cultures.49.连词成句。

小学下册英语第四单元综合卷[有答案]英语试题一、综合题(本题有50小题，每小题1分，共100分.每小题不选、错误，均不给分)1 What do we call a person who plays the guitar?A. PianistB. GuitaristC. DrummerD. Violinist2 The country known for its maple syrup is ________ (以枫糖浆闻名的国家是________).3 How many legs does a spider have?A. 6B. 8C. 10D. 12答案:B4 A substance that can donate protons in a reaction is called a _______.5 The bat flies at _____.6 The __________ (历史的回顾性) fosters reflection.7 I like to watch ______ (体育) events on TV.8 I love to ______ (与朋友一起) enjoy new experiences.9 The first modern Olympic Games were held in ________ (1896).10 A solution that contains a high concentration of ions is called a ______ solution.11 Carta was signed in _______. (1215年) The Magn12 We built a castle with our ____. (玩具名称)13 The boiling point of water is __________ (100度) Celsius at sea level.14 The chemical formula for glucose is ______.15 They are wearing _____ (sunglasses/hats) at the beach.16 The chemical formula for ammonia is __________.17 The _____ (小猫) loves to play with balls of yarn.18 A _______ is a special type of mixture with tiny particles that never settle.19 What is the name of the activity where you throw a ball into a hoop?A. BasketballB. FootballC. SoccerD. Baseball答案: A20 __________ are used in electrical circuits to control current flow.21 What is the largest mammal in the ocean?A. SharkB. DolphinC. WhaleD. Seal答案: C22 I like to go ______ (滑雪) during winter vacations.23 Which of these is a type of tree?A. RoseC. DaisyD. Tulip24 The first man to dive into the Mariana Trench was _______. (维尔德)25 She loves to _______ (sing) in the shower.26 What is the opposite of 'new'?A. UsedB. OldC. FreshD. Recent答案:B27 I can _____ my bed every morning. (make)28 The ______ is a talented actress.29 What is the capital city of Brazil?A. São PauloB. Rio de JaneiroC. BrasíliaD. Salvador答案:C30 A _______ can change colors throughout the seasons.31 The area where an oceanic plate meets a continental plate is called a ______.32 The classroom is ________ and clean.33 What instrument has keys and is played by pressing?A. GuitarB. ViolinD. Flute答案:C34 What is the largest continent?A. AfricaB. AsiaC. EuropeD. North America答案:B35 The ________ (藤) climbs up the wall.36 The boat is ___ (sailing) on the water.37 I can ________ (ride) a skateboard.38 The _______ in the garden are blooming beautifully.39 My favorite toy is a stuffed ______.40 My favorite toy is a ______ (机器人). It can talk and ______ (跳舞).41 We have a ______ (特别的) event this weekend.42 __________ are known to migrate long distances during winter.43 The boy is watching a ________.44 What is the name of the famous American holiday celebrated in December?A. ThanksgivingB. ChristmasC. New Year's DayD. Halloween答案:B45 The __________ is known for its diverse wildlife. (大堡礁)46 What is the name of the famous American actress known for "Gravity"?A. Sandra BullockB. Cate BlanchettC. Jennifer LawrenceD. Emma Stone答案：A47 His favorite game is ________.48 The __________ was a period of exploration and colonization. (大航海时代)49 The fish are ______ (swimming) in the pond.50 What is the capital of China?A. BeijingB. ShanghaiC. GuangzhouD. Shenzhen51 The __________ can provide critical insights into the impacts of climate change.52 What is the name of the famous American national park located in California?A. YellowstoneB. YosemiteC. Grand CanyonD. Zion答案：B53 What is the name of the process by which seeds grow into plants?A. GerminationB. PollinationC. FertilizationD. Propagation答案:A54 What is 15 divided by 3?A. 3B. 4C. 5D. 6答案:C55 A ______ is a substance that can exist in multiple states.56 The chemical formula for -ethoxybutanoic acid is ______.57 How many continents are there?A. 5B. 6C. 7D. 858 What do we call the process of liquid turning into vapor?A. CondensationB. FreezingC. EvaporationD. Sublimation答案:C59 A __________ (科学探索) expands our understanding of the natural world.60 Chemical reactions involve the breaking and forming of ________.61 Comets are often described as "dirty snowballs" made of ice and ______.62 A homogeneous mixture is uniform in _____.63 What do we call the first woman to fly solo across the Atlantic Ocean?A. Amelia EarhartB. Bessie ColemanC. Harriet QuimbyD. Jacqueline Cochran答案:A64 In a chemical equation, reactants are found on the ______.65 What do we call the primary source of energy for living organisms?A. WaterB. SunlightC. AirD. Food答案:B66 What is the main ingredient in mayonnaise?A. OilB. VinegarC. MustardD. Sugar67 He is _____ (playing/doing) video games.68 ts can be grown ______ (室内). Some pla69 My mom enjoys gardening and growing __________ (植物).70 Tokyo is the capital of __________.71 She is a friendly ________.72 What do you call the study of living things?A. BiologyB. ChemistryC. PhysicsD. Geography答案: A73 He is my _____ (好友) from childhood.74 Planting flowers can attract ______ (蜜蜂) to your garden.75 A __________ is a substance made up of only one type of atom.76 The ancient Romans celebrated festivals to honor their _____.77 What is the name of the famous detective created by Arthur Conan Doyle?A. Hercule PoirotB. Sam SpadeC. Sherlock HolmesD. Philip Marlowe答案: C78 What do we call a scientist who studies chemistry?A. ChemistB. BiochemistC. PhysicistD. Pharmacologist79 The _______ (The American Revolution) established the US as an independent nation.80 The flowers are ________ (多彩).81 The singer has a ______ (beautiful) voice.82 The ______ teaches us about different countries.83 What is the opposite of up?A. DownB. LeftC. RightD. Forward84 The study of matter and its changes is called _______. (化学)85 She is a _____ (护士) who helps deliver babies.86 Chemical reactions can be influenced by temperature and _____.87 __________ are found in many types of detergents.88 What do we call the part of the brain that controls balance?A. CerebrumB. CerebellumC. BrainstemD. Hypothalamus答案:B89 What is the main ingredient in bread?A. FlourB. SugarC. RiceD. Salt90 What do we call the process of water turning into vapor?A. CondensationB. EvaporationC. PrecipitationD. Sublimation答案:B91 The _______ of an atom is determined by the number of protons.92 I like to ______ (参与) in student council meetings.93 I saw a ________ hopping along the path.94 Which planet is known for its rings?A. MarsB. VenusC. SaturnD. Jupiter答案: C. Saturn95 Planting bulbs can lead to beautiful ______ (花朵) in spring.96 A hamster is a small ______.97 The __________ is a region known for its social movements.98 A crab can pinch with its ________________ (钳子).99 A _____ (植物分类) can help identify different species. 100 The kitten is ___ (pouncing) on a toy.。

北海2024年10版小学三年级下册英语第3单元寒假试卷考试时间：80分钟（总分:100）B卷考试人：_________题号一二三四五总分得分一、综合题(共计100题)1、What do we call the term for an animal that is active at night?A. DiurnalB. NocturnalC. CrepuscularD. Seasonal答案:B. Nocturnal2、填空题：I enjoy visiting ________ (朋友) after school.3、听力题：The chemical symbol for iron is ______.4、听力题：The process of oxidation involves __________ losing electrons.5、听力题：The chemical formula for potassium nitrate is ______.6、听力题：I want to ________ (explore) my potential.7、听力题：An endothermic reaction feels _______ to the touch.8、Which gas is required for photosynthesis?A. OxygenB. Carbon DioxideC. NitrogenD. Hydrogen9、听力题：The _____ (鱼) swims in the water.10、填空题：The capital of St. Kitts and Nevis is ________ (巴斯特尔).11、填空题：My dad teaches me the importance of __________ (责任感).12、What is the term for a young sheep?A. CalfB. KidC. LambD. Foal13、填空题：Certain plants are known for their ______ (观赏价值).14、填空题：The _____ (生态) includes all living things in an area.15、Which insect is known for making a web?A. AntB. SpiderC. BeetleD. Fly答案:B16、填空题：My dad inspires me to be a better __________ (人).17、填空题：The _______ (Saladin) was a prominent leader during the Crusades.18、听力题：The chemical process that produces energy in our cells is called ________.19、填空题：At the zoo, I saw a playful ________ (猴子) swinging from tree to tree. It made me ________ (笑).20、What do you call the language spoken in Brazil?A. SpanishB. PortugueseC. FrenchD. English答案:B21、听力题：The party is at my ________.22、填空题：A bee gathers _______ from flowers to create honey.23、填空题：My cat’s name is .24、填空题：The ________ (历史遗址保护) is vital for education.25、听力题：I see a _______ (bunny) hopping in the grass.26、听力题：The ______ teaches us about journalism.27、填空题：The __________ (伦敦大火) occurred in 1666.28、How many sides does a hexagon have?A. 4B. 5C. 6D. 7答案:C. 629、What is the color of grass?A. BlueB. RedC. GreenD. Yellow答案:C30、听力题：A solution can become saturated when it holds the maximum amount of ______.31、填空题：Plants need _____ (光照) for photosynthesis.32、How many letters are in the English alphabet?A. 24B. 25C. 26D. 2733、听力题：The element with the symbol Au is ______.34、听力题：I want to _____ (visit/see) my grandma.35、填空题：I have a favorite ______ (颜色), which is blue because it reminds me of the sky.36、听力题：She is _______ (practicing) her dance routine.37、听力题：The symbol for strontium is _____.38、听力题：My favorite fruit is _____ (banana/apple).39、听力题：The dog is ________ and friendly.40、听力题：I can see a ___. (cloud) in the sky.41、听力题：A mixture of metals is called an ______.42、How many vowels are there in the English alphabet?A. 5B. 6C. 7D. 843、填空题：The _____ (花粉) helps in the reproduction of plants.44、What is the capital of Latvia?A. VilniusB. RigaC. TallinnD. Minsk答案:B. Riga45、填空题：In science class, we learned about ________ (机器人). They can help with many________ (任务).46、What is the name of the place where you can see many animals?A. AquariumB. ZooC. ParkD. Circus答案: B47、选择题：Which fruit is yellow and tropical?A. BananaB. CherryC. PeachD. Plum48、What is the opposite of tough?A. SoftB. WeakC. FragileD. All of the above答案:D49、填空题：The color change in a chemical reaction can indicate a _______. (反应)50、What do we call the study of ancient artifacts?a. Anthropologyb. Archaeologyc. Historyd. Sociology答案:B51、What do you call a person who studies rocks?A. BiologistB. GeologistC. AstronomerD. Chemist答案:B52、What is the name of the famous American author known for "The Old Man and the Sea"?A. Ernest HemingwayB. F. Scott FitzgeraldC. John SteinbeckD. Mark Twain答案：A53、听力题：Matter can exist in different states, including solid, liquid, and ________.54、听力题：She is _______ (cooking) dinner for her family.55、填空题：The _____ (细胞结构) of plants is fascinating to study.56、听力题：The _____ (果树) has ripe fruit.57、听力题：A _______ is a chemical reaction that produces a bright color.58、填空题：This ________ (玩具) has many fun features.59、填空题：Plants can be used to improve ______ (土壤质量).60、听力题：I like to play ______ (video games) on weekends.61、Which insect is known for its ability to produce silk?A. AntB. BeetleC. CaterpillarD. Spider62、填空题：The squirrel gathers ______ (食物) for winter.63、听力题：The puppy is _____ (cute/ugly).64、填空题：A sheep provides us with ________________ (羊毛).I saw a _______ (小刺猬) in the garden.66、What is the name of the famous British author known for her mysteries?A. Agatha ChristieB. J.K. RowlingC. Charles DickensD. Jane Austen答案:A67、听力题：My friend studies ____ (history) and enjoys it.68、听力题：A solution that conducts electricity is called an ______ solution.69、填空题：We will go to the ________ (水族馆) next month.70、听力题：The ice cream is _____ in the cone. (cold)71、听力题：My sister sings like a ________.72、听力题：A __________ is a low-lying area that can be flooded.73、What do you call a story that explains why something happens?A. MythB. LegendC. FableD. Tale答案:A74、听力题：Acids can donate a ______ ion.75、Which planet is known for its blue color?A. EarthB. NeptuneC. UranusD. Both B and C76、听力题：Earth’s plates are constantly ______, though we cannot see it happening.The cat is ______ on the window. (sitting)78、填空题：The ________ (土壤) is where plants take their nutrients from.79、填空题：The ________ is a small, bright creature.80、听力题：My grandma enjoys making ____ (candies).81、Which color is a banana?A. RedB. YellowC. BlueD. Green82、听力题：I have a _____ (memory) of the trip.83、What is 3 x 4?A. 10B. 11C. 12D. 1384、选择题：What is the main ingredient in a salad?A. MeatB. VegetablesC. FruitD. Grains85、选择题：Where do most bees live?A. TreeB. HiveC. WaterD. Ground86、What do we call a young turtle?A. HatchlingB. PupC. KitD. Chick答案:A. Hatchling87、听力题：__________ are used to measure the temperature of substances.88、What do we call the study of animals?a. Anthropologyb. Biologyc. Zoologyd. Ecology答案:c89、填空题：My favorite flower is a _____.90、听力题：The chemical symbol for tellurium is _____.91、听力题：A ______ is a natural opening that allows magma to escape.92、听力题：She has long _______ (hair).93、填空题：My toy ________ spins around.94、听力题：The girl loves to ________.95、What do you call the planet we live on?A. MarsB. VenusC. EarthD. Jupiter答案:C96、选择题：What is the capital of Italy?A. VeniceB. FlorenceC. RomeD. Milan97、填空题：The teacher assigns interesting _____ (项目) for students.98、听力题：A _______ is a tool that helps to measure the speed of a moving object.99、How many months are in a year?A. TenB. ElevenC. TwelveD. Thirteen答案:C100、选择题：What do we call a person who tells stories?A. AuthorB. NarratorC. StorytellerD. All of the above。

重庆2024年11版小学四年级下册英语第4单元寒假试卷考试时间：90分钟（总分:120）B卷考试人：_________题号一二三四五总分得分一、综合题(共计100题)1、What is the name of the fruit that is yellow and curved?A. BananaB. MangoC. PearD. Peach答案: A2、听力题：We go to school _____ (everyday/never) in the morning.3、填空题：The ______ (植物的营养需求) varies greatly between species.4、Road was important for __________ (贸易). 填空题：The Silk5、听力题：The chemical formula for lithium hydroxide is ______.6、听力题：The chemical structure of DNA contains ______ bases.7、听力题：A __________ is a measurement of the angle of a slope.8、听力题：The chemical formula for gadolinium oxide is _____.9、填空题：The leaves fall from the _______ in autumn.10、What is the name of the famous waterfall in South America?A. Iguazu FallsB. Niagara FallsC. Victoria FallsD. Angel Falls答案:A. Iguazu Falls11、填空题：My brother is my best _______ who plays games with me.12、填空题：A ______ (海星) lives in the ocean and is colorful.13、填空题：A healthy garden requires good __________ (照顾).14、听力题：The bird sings ___. (sweetly)15、填空题：My best friend's name is . (我最好的朋友叫)16、听力题：My cousin is a ______. She loves to teach children.17、填空题：We need to _______ (提高) our skills.18、What do we call a large body of saltwater?a. Seab. Lakec. Riverd. Ocean答案:d19、选择题：Which animal is known for its long ears?A. CatB. DogC. RabbitD. Mouse20、听力题：Chlorine is commonly used as a _____ to disinfect water.The ________ is a special friend that I cherish.22、What is the name of the first spacecraft to fly by Jupiter?A. Pioneer 10B. Voyager 1C. Voyager 2D. Galileo23、填空题：The ant has a strong _______ (合作) ability.24、听力题：The __________ is a large area of land that is not flat.25、听力题：A polymer is a large molecule made up of many ______.26、填空题：I love to eat ________ (水果) every day.27、What is the name of the place where we can see wild animals in their natural habitat?A. ZooB. SafariC. AquariumD. Farm答案:B28、填空题：My best friend is __________ (聪明的).29、填空题：My _____ (舅舅) is visiting next month.30、What is the sound a cow makes?A. MeowB. MooC. BarkD. Roar31、What do you call the president of the United States?A. Prime MinisterB. ChancellorC. PresidentD. KingA _______ is a chemical compound formed from two different elements.33、填空题：I enjoy ______ (学习) about space.34、听力题：The city of Dublin is the capital of _______.35、填空题：My friend loves to write __________ (诗歌).36、填空题：A rabbit can hop over tall ______ (障碍).37、听力题：A reaction that occurs spontaneously is labeled as a ______ reaction.38、听力题：The sun is ______ in the sky. (shining)39、填空题：The peacock's feathers are stunning during ______ (求偶).40、填空题：The _____ (蟑螂) is not a very popular insect.41、听力题：Organic chemistry is the study of carbon-containing _____.42、听力题：I have a ______ of crayons in my art box. (set)43、填空题：The musician plays in a _____ (乐队).44、听力题：When you mix vinegar and baking soda, you get __________.45、听力题：I want to ________ a new toy.46、What is the name of the fairy tale about a girl who lost her shoe?A. RapunzelB. CinderellaC. Snow WhiteD. Little Red Riding Hood47、填空题：I love reading __________ with my family. (书籍)48、填空题：My aunt loves __________ (运动).49、What is the name of the famous river that flows through Egypt?A. NileB. AmazonC. MississippiD. Yangtze答案:A50、听力题：The ______ can move by swimming or crawling.51、填空题：在中国，农历新年是一个重要的________ (holiday)。

小学上册英语第四单元自测题[含答案]英语试题一、综合题(本题有50小题，每小题1分，共100分.每小题不选、错误，均不给分)1 can Civil Rights Movement took place in the ________ (1960年代). The Amer2 I see a _____ in the sky. (cloud)3 The ability of a substance to dissolve in water is called ________.4 My dad drives a ___ (car/bike).5 What do you call a large body of saltwater?A. OceanB. RiverC. LakeD. Stream答案: A6 What is the opposite of light?A. DarkB. HeavyC. BrightD. All of the above答案:A7 I believe everyone should be treated with respect. Kindness and understanding create a harmonious environment. I always strive to treat others as I want to be treated.8 Stars are made of hydrogen and ______.9 What is the main ingredient in guacamole?A. TomatoB. AvocadoC. LettuceD. Onion答案:B10 The French Revolution began in the year ________.11 A _____ (49) is an area of low land between hills or mountains.12 The Earth's ______ is made up of different layers.13 A ____ is a small insect that helps pollinate flowers.14 What does your _____ (爸爸) do?15 I saw a ________ walking along the path.16 My mom is a __________ (社工).17 What is the freezing point of water?A. 0 degrees CelsiusB. 32 degrees CelsiusC. 100 degrees CelsiusD. 50 degrees Celsius答案: A18 The chemical formula for sodium sulfate is _______.19 My mom is a __________ (土木工程师).20 What is the opposite of "sweet"?A. BitterB. SourC. Salty21 When it’s hot, I like to stay in the __________. (阴凉处)22 My aunt loves __________ (跳舞).23 Planting _____ (果树) provides food for many creatures.24 What do you call a baby cow?A. CalfB. FoalC. KidD. Lamb25 The _____ (芦荟) is good for the skin.26 We are going to the ______ (mountains) for vacation.27 How many days are in a week?A. FiveB. SixC. SevenD. Eight28 Sound travels faster in ______ than in air.29 What do you call the main character in a story?A. HeroB. VillainC. ProtagonistD. Antagonist答案:C30 War was characterized by the arms ________ (竞赛). The Cold31 How many legs does a spider have?B. EightC. TenD. Four32 I love to read ________ (书) before going to bed.33 A ______ is formed when two or more elements chemically bond together.34 The sun is shining ________ (明亮).35 We will _______ (have) a picnic in the park.36 To grow a healthy garden, you must water the ______ regularly. (要种出健康的花园，你必须定期给植物浇水。

化学化工英语试题及答案一、选择题（每题2分，共20分）1. Which of the following is a chemical element?A. WaterB. OxygenC. HydrogenD. Carbon答案：B, C, D2. The chemical formula for table salt is:A. NaOHB. NaClC. HClD. NaHCO3答案：B3. What is the process called when a substance changes from a solid to a liquid?A. SublimationB. VaporizationC. MeltingD. Condensation答案：C4. In the periodic table, which group contains alkali metals?A. Group 1B. Group 2C. Group 17D. Group 18答案：A5. What is the name of the process where a substance decomposes into two or more substances due to heat?A. CombustionB. OxidationC. ReductionD. Decomposition答案：D6. Which of the following is a physical property of a substance?A. ColorB. TasteC. SolubilityD. Reactivity答案：A7. What is the term for a compound that releases hydrogen ions (H+) when dissolved in water?A. BaseB. AcidC. SaltD. Neutral答案：B8. The law of conservation of mass states that in a chemical reaction:A. Mass is lostB. Mass is gainedC. Mass remains constantD. Mass can be converted into energy答案：C9. Which of the following is a type of chemical bond?A. Ionic bondB. Covalent bondC. Hydrogen bondD. All of the above答案：D10. What is the name of the process where a substance absorbs energy and changes from a liquid to a gas?A. MeltingB. VaporizationC. SublimationD. Condensation答案：B二、填空题（每题2分，共20分）1. The symbol for the element iron is ________.答案：Fe2. The pH scale ranges from ________ to ________.答案：0 to 143. A compound that produces a basic solution when dissolvedin water is called a ________.答案：base4. The smallest particle of an element that retains its chemical properties is called a ________.答案：atom5. The process of separating a mixture into its individual components is known as ________.答案：separation6. The study of the composition, structure, and properties of matter is called ________.答案：chemistry7. The process of a substance changing from a gas to a liquid is called ________.答案：condensation8. A(n) ________ reaction is a type of chemical reactionwhere two or more substances combine to form a single product. 答案：synthesis9. The volume of a gas at constant temperature and pressureis directly proportional to the number of ________.答案：moles10. The process of converting a solid directly into a gas without passing through the liquid phase is known as ________. 答案：sublimation三、简答题（每题10分，共30分）1. Explain what is meant by the term "stoichiometry" in chemistry.答案：Stoichiometry is the calculation of the relative quantities of reactants and products in a chemical reaction.It is based on the law of conservation of mass and involvesthe use of balanced chemical equations and the molar massesof substances to determine the amounts of reactants needed to produce a certain amount of product or the amounts ofproducts formed from a given amount of reactant.2. Describe the difference between a physical change and a chemical change.答案：A physical change is a change in the state or form of a substance without altering its chemical composition. Examples include melting, freezing, and boiling. A chemical change, on the other hand, involves a change in the chemical composition of a substance, resulting in the formation of new substances. Examples include combustion and rusting.3. What are the three main types of chemical bonds, and givean example of each.答案：The three main types of chemical bonds are ionic bonds, covalent bonds, and metallic bonds. An ionic bond is formed when electrons are transferred from one atom to another, resulting in the formation of oppositely charged ions. An example is the bond between sodium (Na) and chloride (Cl) in table salt (NaCl). A covalent bond is formed when two atoms share electrons, as seen in water (H2O) where hydrogen atoms share electrons with oxygen. Metallic bonds occur in metals, where a "sea" of delocalized electrons is shared among positively charged metal ions, as in sodium metal。

小学上册英语第1单元测验试卷考试时间：90分钟（总分:120）B卷一、综合题(共计100题共100分)1. 听力题：She has ________ (two) brothers.2. 听力题：The process of a solid turning into a liquid is called ______.3. 听力题：My favorite book is ________.4. 填空题：A turtle moves ______ (慢) but can live a long time.5. 选择题：What do we call the time of year when it snows?A. WinterB. SpringC. SummerD. Autumn6. 填空题：The horse gallops across the ________________ (田野).7. 选择题：Which vegetable is orange and long?A. PotatoB. CarrotC. BroccoliD. Lettuce答案: B8. 填空题：I enjoy playing ______ at home.9. 选择题：What do we call a person who studies physical activity?A. KinesiologistB. PhysiotherapistC. Exercise ScientistD. All of the above10. 听力题：She is _____ (running) in the park.11. 填空题：The ________ (水文条件) affects growth.12. 选择题：Where do fish live?A. TreesB. GroundC. WaterD. Sky答案:C13. 填空题：I enjoy ______ (与朋友一起) going to concerts.14. 听力题：This is my ____ (brother). He is years old.15. 听力题：His hair is ________.16. 听力题：They are _____ (drawing) with chalk.17. 填空题：A __________ day is great for a family outing. (欢快的)18. 选择题：What is the main purpose of a space probe?A. To carry humans into spaceB. To collect data about celestial bodiesC. To photograph the EarthD. To study weather patterns19. 选择题：What do you call a collection of galaxies?A. ClusterB. SuperclusterC. UniverseD. Cosmos答案:B20. 选择题：What is the name of the famous bear from Canada?A. PaddingtonB. Winnie-the-PoohC. Yogi BearD. Baloo21. 选择题：Which device do we use to call someone?A. TelevisionB. PhoneC. RadioD. Computer22. 听力题：__________ are used to balance chemical equations.23. 听力题：He is a good ________ player.24. 填空题:I enjoy playing ________ after school with my friends.25. 填空题：She has a _______ who is very tall.26. 听力题：The gas we breathe in is ______.27. 听力题：A ______ is a type of energy that can cause changes in matter.28. 选择题：What is the opposite of 'hard'?A. ToughB. SoftC. FirmD. Solid答案:B29. 听力题：A ____ is a tiny creature that loves to hop around.30. 填空题：The ______ (蟑螂) hides in dark places during the day.31. 选择题：What is the color of an orange?A. GreenB. YellowC. OrangeD. Red答案:C32. 填空题:I like to plant ________ in the garden.33. 听力题：__________ are mixtures that can be easily separated.34. 填空题：The __________ (历史的推动) inspires change.35. 听力题：The process of photosynthesis occurs in the _______ of plant cells.36. 填空题：My dad encourages me to be __________ (开放的) to opportunities.37. 选择题：What do you call a baby dog?a. Kittenb. Puppyc. Cubd. Calf答案:b38. ts have medicinal ______ that can help treat illnesses. (一些植物具有药用特性，可以帮助治疗疾病。

青岛“PEP”2024年小学5年级下册英语第4单元综合卷[含答案]考试时间：80分钟（总分:110）A卷考试人：_________题号一二三四五总分得分一、综合题(共计100题)1、听力填空题：Reading is one of my favorite activities. I enjoy books about __________ and__________. They take me on adventures and teach me new things.2、听力题：The __________ is a large area of land that is mostly empty.3、听力题：The cat is ______ (sleeping) on my lap.4、听力题：In a chemical reaction, the end products are known as ______.5、听力题：The Grand Canyon is a famous ______ that was formed by the erosion of the Colorado River.6、填空题：We made a robot out of our old ____. (玩具名称)7、听力题：The chemical formula for sulfuric acid is __________.8、填空题：The _____ (兔子) nibbles on fresh greens in the garden.9、听力题：The chemical formula for sodium phosphate is ______.10、填空题：The _____ (青蛙) has a unique way of communicating.The _______ (鹦鹉) is bright and colorful.12、What is the name of the longest river in North America?A. Mississippi RiverB. Colorado RiverC. Rio GrandeD. Missouri River答案: A. Mississippi River13、听力题：My cousin is very good at ____ (science).14、What do we call the process of making a new product?A. ProductionB. ManufacturingC. CreationD. All of the above答案: D. All of the above15、听力题：The park is ________ from my house.16、听力题：The horse is _______ (galloping) in the field.17、What is the primary color of a tiger's fur?A. BlackB. WhiteC. OrangeD. Brown18、填空题：The __________ (历史的纽带) connects us.19、填空题：The rabbit is eating a ______.20、填空题：A tarpon can be caught while ______ (钓鱼).21、填空题：I often ask my __________ for help. (父母)My favorite pet is a ______ (狗) because they are loyal companions.23、What do you call a large area covered with trees?A. DesertB. ForestC. PrairieD. Mountain答案:B24、听力题：The capital of Japan is __________.25、填空题：My ________ (玩具名称) is a character from a movie.26、选择题：What is the opposite of wet?A. DryB. MoistC. HumidD. Damp27、ration of Independence was signed in ________. 填空题：The Decl28、听力题：The __________ is the amount of energy needed to change the temperature of a substance.29、What is the capital of Slovenia?A. LjubljanaB. MariborC. CeljeD. Koper答案:A30、听力题：The city of Malé is the capital of _______.31、听力题：My friend is very ________.32、听力题：The process of crystallization involves forming __________ from a solution.I have ___ apples in my bag. (three)34、填空题：My __________ (玩具名) always makes me smile.35、What is the name of the famous magician known for his escape acts?A. David CopperfieldB. Harry HoudiniC. Penn & TellerD. Criss Angel答案: B. Harry Houdini36、填空题：I love to ______ (与朋友一起) explore new ideas.37、What is the sum of 4 + 4?A. 6B. 7C. 8D. 9答案:C38、听力题：A butterfly goes through four stages: egg, larva, pupa, and __________.39、填空题：The ocean is _______ (平静的).40、填空题：Many plants have medicinal ______ (用途).41、填空题：My brother is a __________ (游戏玩家).42、听力题：I love _____ (奶酪) on my sandwich.43、听力填空题：I think teamwork is important. Working together helps us achieve common goals. In group projects, I like to __________ and contribute my ideas.44、填空题：My friend, ______ (我的朋友), has a pet dog.A _______ (小龙虾) scuttles along the riverbed.46、What is the name of the famous ancient structure located in Greece?A. ColosseumB. ParthenonC. PyramidsD. Stonehenge答案：B47、听力题：A __________ is a reaction that occurs when two substances combine to form a new product.48、填空题：Gandhi is known for leading India to ________ from British rule.49、听力题：We play ______ (volleyball) during gym class.50、听力题：She is _____ (drawing) a picture.51、填空题：I think it’s fun to go ________ (参加舞会).52、听力题：The _____ (鸟) is flying in the sky.53、What do we call the imaginary line dividing the Earth into Northern and Southern Hemispheres?A. EquatorB. Prime MeridianC. Tropic of CancerD. Tropic of Capricorn54、听力题：The process of polymerization creates ______.55、填空题：An understanding of ______ (植物病害) can aid farmers.56、听力题：I like to ________ my friends.The invention of the steam engine was a key development in the ______ (工业革命).58、听力题：The chemical symbol for germanium is __________.59、听力题：The __________ cycle describes how water moves through the environment.60、填空题：The __________ (历史的教育) shapes our understanding.61、What is the hardest natural substance on Earth?A. GoldB. DiamondC. IronD. Silver62、填空题：We should _______ (关心) our neighbors.63、听力题：We went to the _____ (store/market) yesterday.64、填空题：The cat caught a ______.65、听力题：An extinct volcano is one that is unlikely to ______ again.66、 (64) is the fastest river in the world. 填空题：The ____67、选择题：What is the main language spoken in Spain?A. FrenchB. ItalianC. SpanishD. Portuguese68、听力题：I can _____ (dance/sing) very well.69、听力题：We are _____ a field trip next week. (going on)70、What do you call a baby sheep?A. LambB. KidC. CalfD. Foal答案: A71、听力题：My mom is a ______. She enjoys taking photographs.72、听力题：The ____ is a quiet creature that spends most of its time sleeping.73、填空题：My pet ______ (兔子) loves to eat fresh greens.74、填空题：I enjoy making ________ (手工艺品) for my family.75、What do we call the first day of the week?A. SaturdayB. SundayC. MondayD. Friday答案:B76、What do we call a group of fish swimming together?A. SchoolB. PodC. FlockD. Pack77、填空题：My dog loves to play with its ______ (玩具).78、填空题：The _____ (独角兽) is a mythical creature that is very magical. 独角兽是一种非常神奇的神话生物。

小学上册英语第二单元暑期作业(有答案)英语试题一、综合题(本题有100小题，每小题1分，共100分.每小题不选、错误，均不给分)1.My sister is a _____ (演员) who loves theater.2.The discovery of ________ led to significant scientific advancements.3.We like to _____ (travel/study) during summer.4._____ (土壤) quality is essential for plant growth.5.My __________ (玩具名) is really __________ (形容词) to play with.6.I ride my bike to _____ (学校).7.The ancient Egyptians worshipped many _____ and deities.8.What is the main gas in the air we breathe?A. OxygenB. NitrogenC. Carbon dioxideD. Hydrogen答案:B9.The skunk sprays when it feels _________. (威胁)10.The ice cream is ______ (melting) in the sun.11.The capital of Tonga is _______.12.The _____ (owl) is hooting.13.The _____ (bridge) is strong.14.The color change in litmus paper indicates the presence of an ______ or base.15. of __________ (眼泪) refers to the forced relocation of Native Americans. The Trea16.The __________ was a significant document in the history of the United States. (独立宣言)17.My favorite musician is _______ (名字). 她的音乐风格很 _______ (形容词).18.The __________ is a region with many rivers.19.The snake can be found in _________ (森林) and deserts.20.What is the name of the largest mammal in the world?A. Blue WhaleB. African ElephantC. GiraffeD. Bengal Tiger答案:A.Blue Whale21.__________ (外部条件) can alter the outcome of a chemical experiment.22.We have a ______ (大) garden with vegetables.23.I want to learn how to ________.24.My _____ (兄弟) collects toy cars and races them with friends. 我兄弟收集玩具车，并和朋友们比赛。