高二英华作业8
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课时作业(八)UNIT 3Section ⅡLearning AboutLanguage层级一课时跟踪检测维度1单句语法填空1.When I got to the station,the train ________ (leave).2.All the fine ladies and gentlemen of the countryside ________ (invite) before the party began.3.We first met in the Slender West Lake in 2021, and both of us felt immediately that we ________ (know) each other for years.4.Yesterday, the city government rewarded those who ________ (make) contributions to the city's construction in the last years.5.He said he ________ (hope) to spend the important day with us, but he was too busy then.6.The twins, who ________ (finish) their homework, were allowed to play badminton on the playground.7.Arriving at the party in a great hurry, we were disappointed to find that the band ________ (stop) playing.8.Returning to the camp, they were shocked to see everything ________ (ruin).9.Julie was feeling a little blue because her mother ________ (lay) off from her job and she had lots of bills to pay.10.It was the first time that my daughter ________ (ask) to sing in public and she was a bit nervous.11.When she woke up, she found that all her house ________ (destroy) by the thunderstorm.12.Before she came to China, Grace ________ (teach) English in a middle school for about five years.13.All the film tickets ________ (sell) out when I got to the cinema.14.However,a few days later,he was told that a mistake ________(make).15.Our classroom ________ (clean).You needn't clean it now.维度2语法与写作1.这是我叔叔第一次去你的城市开会。
Ⅰ单句语法填空1.What made me unhappy was the terrible working condition rather than the low pay.2.When asked whether she would attend her friend’s wedding ceremony, she didn’t give a definite answer.3.The reason why Johnson got upset was that he failed the math exam again.4.As far as I’m concerned, what we call “luck”is the result of hard work and passion.5.Suddenly it hit her that it was difficult for her father to raise six children.6.We all consider it important that children should have plenty of milk as they grow.7.This is where our problem lies, so can you help solve it?8.One of the most exciting moments in his life was when he was awarded the Nobel Prize for Literature.9.Who will be in charge of the big project hasn’t been decided yet.10.Mr. Lin valued the old watch, so he promised to give a great reward to whoever found it.Ⅱ阅读理解When we say that residents(居民)of North Riverside, Illinois, “wrote the book”on how to be good neighbors, we’re not exaggerating(夸张的). The residents of North Riverside really did write a book on neighborliness that has helped make their town a remarkable place.Neighbors All: Creating Community One Block at a Time is a 65page manual(手册) filled with friendly suggestions(“Be the first to reach out”;“Be concrete in caring”) and inspiring stories, all designed to build “family bonds”among neighbors. Every household gets a copy, delivered by a volunteer “block captain”tasked with welcoming new arrivals, making sure kids play nice, and more. It’s a big job, but the 90 captains spread across the town of 6,700 don’t do it alone. They’re organized by their own captain, Carol Spale, and the Neighborhood Services Committee, which appoints leaders of all ages.If all this seems somewhat bureaucratic(官僚主义的), in practice Neighbors All has very much lived up to its title. One captain, handing out flyers doortodoor, got to chatting with an older couple who said that they couldn’t afford to replace their broken stove. Before long, the Neighborhood Services Committee had collected enough money to buy them a new one.“I have been in North Riverside for over 34 years and am very proud of the smalltown caring the community shows every day,”Vera Jandacek Wilt wrote.Waters rising in the river, ready to flood nearby homes? Residents and officials are filling sandbags to hold back the floods. A family is made homeless by a fire? Residents step up toprovide food, clothing, and anything else the family needs. Lonely seniors can’t remember the last time they stepped out of their house? A block captain shows up to invite them to a block party. This community truly looks out for one another. Does all this mean that North Riverside is perfect? No—neighbors still argue. Kids still fight. But the community spirit that is part of North Riverside’s DNA can be seen all over the town.【解题导语】本文是一篇说明文。
课时分层作业(四)Section Ⅰ[高考题型练习提能力]Ⅰ.阅读理解AThe United States government has decided that foodfrom cloned cattle,pigs and goats is safe to eat.The Food andDrug Administration also says it found no risk in meat andmilk from cloned animals.The F.D.A.had looked at studies for several years before it announced its decision in a final report this month.The United States Department of Agriculture supported the findings.But it says time is needed to clear the way for marketing meat and milk from clones.The F.D.A.will not require any product to be registered as coming from clones.A producer would need to label(标注) a product“clonefree”.The agency says that could be misunderstood because the food is not different from other food.But activists argue that the F.D.A.based its decision on incomplete research into possible risks.The Center for Food Safety criticized the use of studies supplied by cloning companies.Animal rights activists point out that cloning attempts often fail.They say cloning is cruel and can lead to suffering.Congress(国会) has been trying to get the F.D.A.to do more studies.But the agency noted that experts in New Zealand and the European Union had come to the same findings about the safety of food from clones.Japan and South Korea say they want to study it further before taking action.Products from cloning may not be widely used for several years.Clones cost much,which is why they are not widely used for feeding.The Agriculture Department says few clones will ever become food.Their traditionally raised animals would enter the food supply instead.【语篇解读】本文讲述了美国食品药品监督管理局在宣布一些克隆动物可以作为食品后引发的争论。
Unit 1Period 2Ⅰ.基础知识A.单词拼写1.There is a ________ (明显) improvement in your spoken English.2.Scientists are working to find a ________ (方法) of storing this type of power.3.He ________ (决定) that he should become a doctor.4.How long can the present business ________ (繁荣) last?5.The ________ (多数) of his books are kept upstairs.6.My mother suffered all kinds of ________ (艰难) throughout her life.7.A large ________ (比例) of school-books now have pictures.8.The ________ (联邦制的) Republic of Germany was the official name of West Germany.9.All ________ (飞行器) must fuel before a long flight.10.The school has children from many different ________ (种族的) groups.【答案】1.distinct 2.means 3.elected 4.boom 5.majority6.hardships7.percentage8.Federal9.aircraft10.racialB.选用合适的单词或短语并以其适当形式填空used for traffic.2.The teachers are trying to improve our English ________ listening,reading,writing and speaking.3.Of all the immigrants,Chinese made up 30________.4.Although his house was destroyed in the heavy snow,he was encouraged to ________.5.Zhang Yugui ________ by planting vegetables in a greenhouse but suddenly it caught fire on the third day before the festival.6.Most of the Chinese people still ________ the custom of eating zongzi at the Dragon Boat Festival every year.7.________ the fire-engine arrived,the fire had been put out by the inhabitants.8.Customers are treated without ________ of sex and age.9.John has been ________ the manager of the company for his hard work.10.It is a rule in the Party's constitution(章程) that the minority should obey________________.【答案】1.booming 2.by means of 3.percent 4.live on5.made a life6.keep up7.By the time8.distinction9.elected as10.the majorityC.单项选择()1.Less than twenty percent of the employees in their company are women.That is to say,men are in the________.A.majority B.activityC.possibility D.minority()2.A new cure for the disease is________to be discovered.A.like B.likelyC.possible D.probable()3.These are the highest________that have ever been given by the government.A.distinctions B.acquisitionsC.expansion D.connections()4.Remember to________a good state of mind even if you should fail plenty of times.A.take up B.brush upC.get up D.keep up()5.An uncle of mine lived________cancer for over 20 years,and died________January at the age of 86.A.for;from B.with;ofC.with;in D.against;with()6.Mark of Youth tells the story of four Senior 3 students in a top high school in the days ______up to the national college entrance examination.A.led B.leadingC.having led D.being led()7.After________ the top leader of the Communist Party of China,Xi Jinping urged the officials to give up their waste-generating habits.A.elected B.electingC.being elected D.to be elected()8.The teacher made__________ clear that ice cream is junk food.A.it B.thisC.that D.one【答案】1.A 2.B 3.A 4.D 5.C 6.B7.C8.AD.完成句子1.我借助报纸上的一则公告找到了我的自行车。
Ⅰ单句语法填空1.Mr. Liu had no idea what had happened to his son at school.2.He gave the poor girl the schoolbag, which his father bought for him yesterday.3.I have no idea how he has raised so much money in such a short time.4.News has spread that more high school graduates will be admitted into universities.5.The possibility that the majority of the labor force will work at home in the future is strong.6.I’ve come to the conclusion that it was very wise of us to do that.7.There is much chance that Bill will recover from his injury.8.His suggestion that the meeting should be delayed was turned down.9.The question who should do the work requires further consideration.10.We expressed the hope at the airport that they would come and visit China again.Ⅱ阅读理解Aquaculture—or sea farming, as it is sometimes called—is one of the brightest hopes for finding an answer to the problem of a world food shortage. Although it may be years before aquaculture yields(产出) really large quantities of food, it is already partially successful. One of its successes is the growing of oysters(牡蛎).Oyster farming is a big new business on Cape Cod, where large crops of oysters have been harvested. The waters there were famous for delicious oysters until the supply gave out about fifteen years ago. “There’s a whole generation of people who have never eaten oysters,”says Karl Touraine, marketing director of Aqua Dynamics Corporation, a company that grows oysters on strings hanging from metal racks(金属架). “For about twenty years the oyster has been in short supply, and our aim is to change this by using new, modern growing techniques,”he explains.“Wareham, on Cape Cod, is the first place in the United States where oysters are being grown on racks just off the bottom of the sea,”says Hank McAvoy of the National Marine Fisheries Service in Gloucester. “But there’s nothing new about offbottom raising, ”Mr. McAvoy adds. “It’s been done successfully in Norway and Australia and, in the last few years, in Spain. The Japanese have used this form of aquaculture for years, and they’re the most successful, with a yearly crop of fortysix thousand pounds of shelled oysters to the acre.”The Aqua Dynamics group grows oysters on strings, away from the bottom so that the oysters’enemies cannot reach them. “When an oyster can avoid enemies and live in unpollutedwater with plenty to eat, he’ll grow fat in four years,”Karl Touraine explains. “Oysters will attach themselves to almost anything they can,”he continues. “At Wareham, we use shells which we tie with nylon strings hanging from metal racks. We lower the strings into the water, leaving at least a foot of water between the lowest shell and the bottom.”“So far the growth has been excellent and the taste is just delightful,”Mr. Touraine notes happily.【解题导语】本文是一篇说明文。
课时作业8Ⅰ.阅读理解阅读下面短文,从每题所给的A、B、C和D四个选项中,选出最佳选项。
They are called “sea parrots”,and sometimes “clowns (小丑) of the sea”!Atlantic puffins (海鹦) are small seabirds which are around 25 cm in length.They have black and white feathers and a large p arrotlike beak (鸟喙).The beak changes color during the year.In winter, the beak has a dull gray color, but it turns orange in spring!Puffins spend most of their lives out at sea, resting on the waves when not swimming.They live on the eastern coast of Canada and the United States, and the western coast of Europe.Puffins live off small fish such as herring, hake and sand eels.Puffins flap (拍) their wings up to 400 times a minute and speed through the air at up to 88 km an hour.Wow! What's more, puffins can dive down 60m under water in search of their favorite fish.In spring and summer, thousands of puffins stay together on the coasts and islands of the North Atlantic Ocean to start a puffin family.They usually pair up with the same partner as before.Some may have been together for 20 years! Puffins dig out a hole usually in a grassy bank.Both parents take it in turn to incubate (孵化) the egg for the next 36-45 days!Although puffins are not classed as an endangered animal, their population in some places is becoming smaller.The main reasons are overfishing,which can lead to a shortage of food for puffins, and pollution—especially oil spills (溢出).Not only does the oil make these beautiful birds sick, it harms their feathers.本文为说明文。
Ⅰ品句填词1.The man who hit 9 people in a row had drunk so much that his mind could no longer distinguish(辨别) between fantasy and reality.2.The abrupt(突然的,意外的) change of time schedule gave the passengers lots of trouble.3.All the researches suggest that quitting smoking and avoiding passive (被动的) smoking are good for our health.4.I am so glad that my job interview should be so successful, which is far from my expectation(期望).5.The old woman held the vase with caution(小心) which was passed on from generation to generation.6.The witness told the police that the deserted girl was adopted by a merciful(仁慈的) old couple.7.Those bananas aren’t ripe(成熟的) yet—they’re still green.8.Success in making money is not always a good criterion(标准) of success in life.9.This meeting is of great importance and if it is convenient(方便的) for you, come at six o’clock please.10.In my opinion, only by facing difficulties bravely and seizing(抓住) opportunities can one succeed.Ⅱ完成句子1.根据我们的计划,这个夏天似乎没有旅行的机会了。
2019-2020学年高二英语人教版暑假作业(8)复习过去分词(作定语、表语和宾语补足语)1. Some young people like to have their hair ____ into different colors.A. dyeB. dyingC. dyedD. to dye2.—Did Peter fix the computer himself?—He ________ because he doesn’t know much about computers.A.has it fixedB.fixed itC.had it fixedD.had fixed it3.—Do you know anything about War of Seven Kingdoms, the Chinese Game of Thrones? —Sure. Although each event ________ a well-known actor playing the key roles, it has all its plots well ________ on established historical records and archaeological findings.A. features; groundedB. characteristics; witnessedC. stars; dependedD. displays; commented4.Jim has retired, but he still remember the happy time ___________ with his students.A.to spendB.spendC.spendingD.spent5.I need a new passport so I will have to have my photograph ___________.A.takingB.takenC.being takenD.take6.Most colleges now offer first-year students a course specially ___________ to help them succeed academically and personally.A. designedB. designingC. to designD. being designed7.You must get the work __________ before Friday.A.doB.to doC.doingD.done8.That program ________to raise funds for farmers in the west of China proves to be an effective approach ________the problem of poverty.A. meant; to solvingB. meaning; to solveC. being meant; to solvingD. meant; to solve9.Students present insisted that the thief in prison.A. referred to be putB. refer to be putC. referred to being putD. was referred to put10.When we saw the road _________with snow, we decided to spend the holiday at home.A. blockB. to blockC. blockingD. blocked11.To learn English well, we should find opportunities to hear English _____ as much as we can.A.speakB.speakingC.spokenD.to speak12、—How do you deal with the disagreement between the company and the customers?—The key ____ the problem is to meet the demand _____ by the customers.A.to solving; makingB.to solving; madeC.to solve; makingD.to solve; made13. Prices of daily goods ________ through a computer can be lower than store prices.A. are boughtB. boughtC. been boughtD. buying14.There are 30 people in the traffic accident but the injured rescued at once.A.injure; wereB.injuring; wasC.injure; wasD.injured; were15.The manager would like to see his plan __________(carry) out as soon as possible.16.The soldiers finally managed to enter the city ___________(surround) by the enemies.17.Now you must be interested in enjoying some pictures ___________(relate) to the school life in the UK,aren’t you?18.He rented a beautiful office and had it ___________(furnish) with antiques.19.Mark has stayed in Shanghai for twenty years and he is ___________ (astonish) by what has changed here.20.Police will have the pictures __________(large) in an attempt to identify the thief.21.The old man wore an eyeglass __________(attach) to a piece of ribbon.22.To research the problem of water pollution, I’d like you to look at a study ____________(conduct) in Australia in 2015.23.The boys went into the cave with a lit stick and the scenery was very touched.(错误个数:3)24.The office of the Students' Union will contact the choosing candidates for an interview in a few days.25.He is best known for his novels setting in his childhood world on the Changjiang River.26.Cathy insisted on being sending where she was most needed.27.I’d like to le arn something about the brand of the knife that advertised on your website.28.Teaching is really a challenging and demanding job. As a new teacher, he felt challenging by the naughty students.29. Ahead of this year’s London Book Fair in March, media r eported a rise in interest in translated works among British readers. For translator Anna Holmwood, this signals the①_______ (arrive) of a new era.“This is a big moment for Chinese fiction abroad,” says Holmwood,②_______has translated Chinese literature for almost a decade.Her translation work, Legends of the Condor Heroes, a fantasy novel written by Jin Yong, and Liu Cixin’s science-fiction book, The Three Body Problem, are shown in a Nielsen report③_______examples of two of the most popular Chinese fiction works in Britain in 2018.“Languages in growing demand include Chinese and Arabic.” according to the Nielsen report. It found that, against the commonly④_______ (see) “not more than 3 percent rule” of translated literature’s presence in the English-language book markets, the number for 2018 was 5.63 percent in Britain ⑤_______the total annual sales was worth $27.1 million.Charlotte Collins, translator and co-chair of the British Translators Association, says: “As we can see, this proportion (比率)⑥_______ (double) in recent years. This is⑦_______ (real) exciting news.”The Guardian quotes (引用) Fiammetta Rocco, administrator of the Man Booker International Prize, “⑧_______ (read) fiction is one of the⑨_______ (good) ways of putting ourselves in other peopl e’s shoes. The rise in sales of translated fiction⑩_______(show) how hungry British readers are for terrific writing from other countries.”30.假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文.文中共有10处语言错误,每句中最多有两处.每处错误仅涉及一个单词的增加、删除或修改.增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词.删除:把多余的词用斜线(\)划掉.修改:在错的词下画一横线,并在该词下面写出修改后的词.注意:1.每处错误及其修改均仅限一词.Last term, I hosted an exchange student calling Jacob from the Great Britain to our schoo1.He really cares for Chinese culture. Jacob asked me to show himself around the city onweekends. I took him to many local place of interest and we also go to the theater to watch a show of Peking Opera. He was so attracted by the performance as he decided to learn it. My father happened to know a master of Peking Opera and introduced Jacob to him. Jacob was great honored to be one of his students. Put his heart into it, Jacob made a rapid progress. When he returned England, he gave a performance, for what he won much admiration from his classmates.答案以及解析1.答案:C解析:一些年轻人喜欢吧他们的头发染成各种颜色.这里应该用完成时have something+过去分词,表示被动,此处用dye的过去分词dyed.2.答案:C解析:have sb. done是动词+ed形式作宾语补足语,表示“使(让,请)别人做某事”。
Ⅰ品句填词1.They sang and danced merrily(高兴地) and had a wonderful party.2.One freezing(严寒的) December day, I was driving to the market on an icy road when I saw a man lying on the ground.3.Watching the innocent(天真无邪的) smile on the little girl’s face, I couldn’t help being moved.4.There is a locked drawer in my office, where many important files(档案) are kept.5.He would like to buy a pot made of stainless(不锈的) steel, because it looks nice and lasts longer.6.In my opinion, your brother has the competence(能力) in running a company well.7.Mrs Brown opened the box with great caution(谨慎), and took out the Chinese vase.8.The couple seized(抓住) this good opportunity and made a large amount of money.9.Mr Zhang tapped(轻拍) me on the shoulder, saying“Nothing can prevent you from realizin g you dream.”10.The Tesla test car was equipped with special side wheels that could help keep the vehicle stable(稳定的) during the ride.Ⅱ选词填空call up; now and then; hang on; ring off; out of order; get through; ring back; set out1.The doctors set__out to perform the operation after a careful physical examination.2.My cell phone was out__of__order yesterday. As a result, many people, including my parents, couldn’t contact me.3.Don’t ring__off,__Peter. Your brother wants to talk about something with you.4.Please hang__on and I’ll tell Mr Smith that he is wanted on the phone at once.5.Mr King stopped now__and__then to chat with elderly men and women on their way to the market nearby.6.When Shirley comes back from work, I will tell her to ring you back.7.What happened to you last night? I phoned you several times but couldn’t get__through to you.8.Mrs Brown called__up and asked whether we could go for a picnic with her family.Ⅲ完成句子1.我认为由机器人来完成最危险和最累人的工作的日子快要到来了。
Unit 4Period 3Ⅰ.单词拼写1.Growing up in a m________ family, William had fertile soil for music creation.2.They bought the clock at a(n) ________ (古董) shop in Paris.3.Justin tried to ________ (抢劫) a bank, but failed.4.My ________ (长袜) is always full of presents at Christmas.5.Different people have a different understanding of ________ (佛教).【答案】1.musical 2.antique 3.rob 4.stocking 5.BuddhismⅡ.语法巩固A.单句语法填空1.At the routine office meeting,the headmaster insisted that the problems________(refer) to be paid special attention to.2.Almost________(freeze),the old man could not get off the ground.3.This problem was not important,________(compare) to others she faced.4.________(exhaust) by the running,they went on running after the robber.5.________(laugh) at by many people,he continued his study.6.She returned to the shop the following morning ________ (dress) in a woolen coat,with a handbag in one hand and a long umbrella in the other.7.________(satisfy) with her reply,Telemachus first set out for the island of the Cyclops to seek news of Odysseus.8.________(hesitate) whether to leave or not,the man stayed where he was.9.________(warn) many times,they became more careful in doing the job.10.________(seize) the letter from the boy,Maggie ran away at once.【答案】1.referred 2.frozen pared 4.Exhausted5.Laughed 6.dressed7.Satisfied8.Hesitating9.Having been warned10.Having seizedB.用过去分词或状语从句改写下列句子1.Asked what had happened, he lowered his head.________________ what had happened, he lowered his head.2.Grown in rich soil, these seeds can grow fast.________________ in rich soil, these seeds can grow fast.3.Left at home alone, John didn't feel afraid at all.________________ at home alone, John didn't feel afraid at all.4.No matter how frequently they are performed, the works of Beethoven still attract people from all over the world.No matter how frequently ________________,the works of Beethoven still attract people from all over the world.【答案】1.When he was asked 2.If they are grown3.Although he was left 4.performed C.句型转换1.Asked to stop,the excited speaker kept talking at the meeting.________ ________ ________ asked to stop,the excited speaker kept talking at the meeting.2.I won't go to the evening party, even if I am invited.I won't go to the evening party,________ ________ ________.3.After we spent all the money,we started looking for jobs.All the money ________,we started looking for jobs.4.Caught in a heavy rain,he was wet to the skin.________ ________ ________ caught in a heavy rain,he was wet to the skin.5.When he was asked why he did it,he said it was his duty.________ why he did it,he said it was his duty.【答案】1.Though he was 2.even if invited 3.spent4.As he was 5.AskedⅢ.能力提升A.语法填空阅读下面材料,在空白处填入1个适当的单词或括号内单词的正确形式。
高二英华作业8
姓名 班级 学号
1.A和B是属于同一生物体内的两个细胞,通过对其DNA分子含量的测定发现,A细胞中
的DNA含量是B细胞的两倍,最可能的解释是 ( )
A.A细胞是有丝分裂过程中中心体相互分离时的细胞,B细胞是减数分裂过程中着丝
点分裂染色体移向两极的细胞
B.A细胞是正常的体细胞,B细胞处于减数第一次分裂结束时的细胞
C.A细胞是处于有丝分裂前期的细胞,B细胞处于有丝分裂后期的细胞
D.A细胞是处于有丝分裂后期的细胞,B细胞处于有丝分裂前期的细胞
2.某动物一个卵原细胞经过减数分裂产生的次级卵母细胞中的DNA分子含量为4a,则其同
种动物的初级精母细胞的DNA分子含量和体细胞的DNA分子含量分别为 ( )
A.8a和8a B.8a和4a C.4a和4a D.4a和2a
3.下列符号代表精子的染色体,a和a/、b和b/、c和c/为同源染色体,下列来自同一精原
细胞的精子是 ( )
A.abc/、ab/c、ab/c、abc B.a/bc、ab/c、ab/c、a/b/c
/
C.ab/c/、a/bc、a/bc/、abc D.ab/c、a/bc/、ab/c、a/bc
/
4.下列关于同源染色体的叙述中,正确的是①同源染色体一条来自父方,一条来自母方 ②
同源染色体是由一条染色体经过复制而成的两条染色体 ③同源染色体的形状和大小
一般都相同 ④在减数分裂中配对的两条染色体 ( )
A.①②③ B.①②④ C.①③④ D.②③④
5.下列有关受精作用的叙述中,错误..的一项是 ( )
A.受精卵中全部遗传物质,来自父母双方的各占一半
B.受精时,精子和卵细胞双方的细胞核相互融合
C.受精卵中染色体数与本物种体细胞染色体数相同
D.受精卵中染色体,来自父、母双方的各占一半
6.在四倍体西瓜植株的花朵上,去雄后授以普通二倍体西瓜的花粉,发育成的西瓜果皮、
胚及发育过程中胚乳细胞中的染色体组的数目分别是 ( )
A.3、3、5 B.4、3、3 C.4、2、3 D.4、3、5
7.性染色体为(a)xy和(b)yy的精子产生的原因是 ( )
A.a减Ⅰ分裂不分离,b减Ⅰ分裂不分离
B.a减Ⅱ分裂不分离,b减Ⅱ分裂不分离
C.a减Ⅰ分裂不分离,b减Ⅱ分裂不分离
D.a减Ⅱ分裂不分离,b减Ⅰ分裂不分离
8.与有丝分裂相比较,只发生在减数分裂过程的是 ( )
①染色体复制 ②同源染色体配对 ③细胞数目增多
④基因重组 ⑤基因分离 ⑥着丝点分裂
A.②④⑤ B.②③④ C.④⑤ D.②④
9.青蛙在水中完成受精作用,受精过程可分为下列步骤,其中体现受精作用实质的是( )
A.同类精子与卵细胞互相识别 B.精子头部进入卵细胞内部
C.卵细胞膜增厚形成受精膜 D.精子细胞核与卵细胞核互相融合
10.下图是按顺时针方向表示的4种植物细胞的细胞周期, 其
中说法正确的是 ( )
A.图中的b→a→b表示细胞增殖过程的一个细胞周期
B.甲图的b→a与丙图的b→a所用的时间可能一样长
C.从a→b,由于DNA的复制使染色体数目增加一倍
D.观察植物细胞有丝分裂的实验材料最好是选植物甲
11.下图表示某动物的某个器官中的一些细胞图像。请据图
回:
(1)综合分析可以断定,该生物的体细胞内含有________________条染色体。
(2)A细胞核内含有 个DNA分子。
(3)D细胞处在________________期,B细胞正在进行__________分裂。
(4)具有同源染色体的细胞有_______________。(用图中字母表示)
(5)图中细胞分裂所需要的能量由____________提供,它主要是由_____________(细胞
器)产生的。
(6)如果F是E细胞分裂形成的两个子细胞中靠下方的那个,请绘出形成F的细胞处于中
期时染色体、中心体、纺锤体的图像。
(7)在图中B细胞的下一分裂时期为________________期,并且这一时期的主要特点是
_________________________。B细胞分裂形成的子细胞的名称是________________。
(8)若图示的细胞是由A细胞经连续的变化得到的:那么图中所示的细胞分裂可能发生在
______________;用图中的字母表示出细胞连续变化的先后顺序_________________。
1、B 2、D 3、D 4、A 5、C 6、B 7、D 8、B 9、B
10. (1)E;//C (2)两;//四 (3)四分体(联会);//交叉互换 (4)A;//初级 (5)A、
B、C、E、F;//非姐妹染色单体交叉互换;//A、B、C(或B与C);//自由组合;//A、B、
C、D、E、F;//A、B、C (6)B、C、D;//F(上一次作业答案)