1-6单元选择题

人教版英语七年级下1-6单元基础复习（二）句型转换专项训练一、句型转换（本大题共30小题，共60.0分）1.He can play the guitar. (改为一般疑问句，并作否定回答)________ he play the guitar? No, he________.2.My brother can play the drums.（加dance改为选择疑问句）____________ ____________ brother play the drums ____________ dance?3.My friend wants to join the music club.（对画线部分提问）____________ ____________ ____________ your friend ____________ to join?4. A pig can’t swim.（用I think改写句子）I _________ think a pig _________ swim.5.Peter wants to join the dancing club.（改为否定句）Peter ____________ ____________ to join the dancing club.6.She wants to know about my school life.（对画线部分提问）____________ ____________ she ____________ to know about?7.按要求完成句子They go to school at seven o’clock.（对画线部分提问）_________ _________ _________ they go to school?I brush my teeth twice（两次）a day.（改为一般疑问句）_________ you _________ your teeth twice a day?Jim gets dressed at five fifty.（改为否定句）Jim _________ _________ dressed at five fifty.Does your father go to work early?（作否定回答）_________, _________ _________.He usually plays sports on weekends.（对画线部分提问）_________ _________ he usually _________ sports?8.按要求完成句子Kate takes a shower at 5:00.（对画线部分提问）_________ _________ does Kate take a shower?Students usually eat dinner at a quarter to seven in the evening.（对画线部分提问）_________ _________ students usually _________ dinner?Now it’s five thirty.（改为同义句）Now it’s _________ _________ _________.Our school begins at seven fifty.（改为同义句）Our school begins at _________ _________ _________.He does homework at 7:00 every evening.（对画线部分提问）_________ _________ he _________ at 7:00 every evening?9.Bob often gets to school by bike.（对画线部分提问）_____________ _____________ Bob often _____________ to school?10.It takes about 50 minutes to walk there.（对画线部分提问）_____________ _____________ _____________ it _____________ to walk there?11.The bus ride takes 20 minutes.（对画线部分提问）______________ ______________ does the bus ride ______________?12.My father usually takes the bus to work.（改为同义句）My father usually _____________ to work _____________ _____________. 13.按要求完成句子It takes about forty minutes to get to the shop.（对画线部分提问）_________ _________ _________ it _________ to get to the shop?I usually go to school on foot.（对画线部分提问）_________ _________ you usually _________ to school?My home is about two kilometers from school.（对画线部分提问）_________ _________ is _________ home from school?The school is two kilometers from my home.（改为同义句）_________ is two kilometers _________ the school _________ my home.My mother goes to work in her car.（改为同义句）My mother _________ _________ _________.14.I usually walk but sometimes I take the bus.（用he改写）He usually ______________ but sometimes ______________ ______________ the bus.15.按要求完成句子Students can run and talk loudly in the hallways.（改为否定句）Students _________ run _________ talk loudly in the hallways.Maria has to practice the piano on Sundays.（改为一般疑问句）_________ Maria _________ _________ practice the piano on Sundays?You can’t eat in the classroom.（改为否定祈使句）_________ _________ in the classroom.You must look after your sister.（改为同义句）You _________ _________ look after your sister.They have to clean the classroom every day.（对画线部分提问）_________ _________ they have to _________ every day?16.句型转换Mary can go out and watch TV, too.（改为否定句）Mary _________ go out _________ watch TV, _________.She has to go home now.（改为否定句）She _________ _________ _________ go home now.Do your homework at school.（改为否定句）_________ _________ your homework at school.We have to wear the school uniform.（对画线部分提问）_________ do you have to wear?17.按要求完成句子I like pandas because they are very cute.（对画线部分提问）________ do you like pandas?The zoo is behind the school.（对画线部分提问）________ is the zoo?He likes elephants.（对画线部分提问）________ ________ does he like?Dolphins are smart because they can help people.（改为同义句）Dolphins can help people, ________ they are smart.She likes playing basketball because it’s interesting.（对画线部分提问）________ ________ she like playing basketball?I don’t like math because it’s a little difficult for me.（改为同义句）Math is ________________ difficult for me, ________ I don’t like it.18.按要求完成句子My mother is making dinner in the kitchen.（对画线部分提问）__________ __________ your mother __________ in the kitchen?Mary is talking on the phone.（改为否定句）Mary __________ __________ on the phone.They are washing their clothes at home.（改为一般疑问句）__________ __________ washing their clothes at home?Is your grandfather reading a newspaper?（作否定回答）__________, __________ __________.Jack does his homework every day.（改为否定句）Jack __________ __________ his homework every day.19.按要求完成句子I am eating some cakes now.（改为一般疑问句）__________ __________ eating __________ cakes now?The students are reading and talking in the classroom.（改为否定句）The students __________ reading __________ talking in the classroom.The little boys are playing football in the park.（对画线部分提问）__________ __________ the little boys __________ in the park?Are you and Bob reading books in the study（书房）now?（作肯定回答）__________, __________ are.The pandas are sleeping under the tree.（对画线部分提问）__________ are the pandas __________?20.Please close the window. (改为否定句)_____ _____ the window, please.21.I want to see a film.（同义句转换）I want to _________ _________ the _________.22.Mary is playing with the bird.（改为一般疑问句并做否定回答）_________ Mary _________ with the bird?No, she _________.23.Does your mother have to work on weekends?（改为肯定句）My mother __________________ work on weekends.24.按要求转换句型（1）Paul has to eat outside．（改为一般疑问句）________Paul________ ________eat outside（2）They can wear hats in the hall．（改为一般疑问句）________they________hats in the hall（3）The students have to wear sports shoes for the gym class．（对画线部分提问）________do the students________ ________ ________？（4）You can’t stand in the middle of the street．（改为祈使句）________ ________in the middle of the street．（5）Take the pen to your sister．（改为否定句）________ ________the pen to your sister．25.同义句转换Most students like going to school by bus.Most students like going to school ________ ________ bus.= Most students like ________ ________ ________ to go to school.I spend about 20 minutes getting to school every day.It ________ me about 20 minutes ________ ________ to school every day. Sally never goes to the market by bike.Sally never ________ ________ ________ ________ the market.= Sally never goes to the market ________ ________ ________.He goes to school on foot.He ________ ________ school.Have fun at school.________ ________ ________ ________ at school.Lucy always takes the subway to school.Lucy always ________ ________ school ________ ________.26.按要求完成句子I like singing. I like dancing, too.（改为同义句）I like singing. I ________ ________ dancing.I want to tell you the news.（改为同义句）I want to tell the news ________ ________.She has a brother and a sister.（改为否定句）She ________ have a brother ________ a sister.They are in the music club.（改为否定句）They ________ ________ in the music club.They can swim.（改为一般疑问句）________ they ________?27.We can't go to a picnic because of the heavy rain．We can't go to a picnic______it's raining heavily．（同义句转换）28.He didn't catch the last bus，so he had to go back on foot．He had to walk back______ he______ the last bus．29.She has to help her mother to cook dinner.（改为一般疑问句）_________ she _________ to help her mother to cook dinner? 30.The elephants are kind of smart.（改为同义句）The elephants are _____________ _____________ smart.答案和解析1.【答案】Can can’t【解析】根据He can play可知此句的助动词是情态动词can，因此变为一般疑问句时，第一空把Can 位于句首，否定回答时，第二空用can’t。

小学四年级英语上册测试题（一） 姓名一. 写出所给字母的相邻字母的大小写：____e____ ____D____ ____G____ ____Hh____ f____ ____二．单项选择。

（ ）1.Mike : Nice to meet you. John: _____________.(A) Nice to meet you. (B) Good morning.（ ）2.Sarah: What ’s in the classroom? Wu Yifan:_________.(A) A board,tow lights. (B) It ’s nice and clean.（ ）3.Chen Jie :Let me clean the board. Amy: _____________.(A)OK. (B) Hello.（ ）4.教室里面有什么？(A)What ’s in the classroom ? (B)What ’s on the board?（ ）5.我们有一间新教室。

(A)I have a pen. (B)We have a new classroom.（ ）6.A: Where ’s my seat? B:_____________.(在门旁边)(A)It ’s near the door. (B)It ’s near the desk.（ ）7.A.Good morning! B:______________!(A)Good afternoon. (B)Good morning.（ ）8.A ：Hello! B:______!(A) Nice to meet you. (B) Hello.( )9.A: How old are you ? B: _______.(A) I ’m 10. (B) I ’m fine.( )10.让我们一起擦玻璃吧！(A)Let ’s clean the window. (B) Let me clean the board.三．选择与图片对应的句子。

《市场营销知识》会考第一章市场营销概述一、单项选择题1、下列表述中正确的是（）A. 市场营销者创造人们的欲望和需要B. 交换是交易的基本单元C. 产品是指能够用以满足人类某种需要或欲望的任何有形东西D. 需求、产品、交换、交易是市场营销的核心概念2、在交换双方中，更积极、更主动的寻求交换的一方称为（）A. 潜在顾客B. 顾客C. 卖方D. 市场营销者3、“迪斯尼乐园的产品不是米老鼠、唐老鸭，而是快乐”，这体现的市场营销管理哲学的是（）A. 生产观念B. 产品观念C. 市场营销观念D. 社会市场营销观念4、“本公司旨在制造面粉”体现了下列哪个观念（）A. 生产观念B. 推销观念C. 生态营销观念D. 社会营销观念5、（）是一种“营销近视症”，它片面强调产品质量，而忽视市场需求。

A. 生产观念B. 产品观念C. 推销观念D. 市场营销观念6、市场营销是由英文中哪一词翻译而来的（）A. MarketB. MarketingC.MarkedD. Marking7、下列关于需要、欲望和需求的说法错误的是（）A. 人类的需要有限，欲望无限B. 市场营销者可以创造人们的需要和欲望C. 市场营销者可以影响人们的需求D. 只要具有购买能力，欲望、需要便转化为需求8、假如有几个人同时想买正在市场上出售的某种奇缺产品，每个准备购买的人都尽力使自己被卖主选中，这种情况下，市场营销者是（）A. 卖主B. 买主C. 双方都是D. 双方都不是9、“请您购买我们厂的产品”和“您需要什么？让我们来为您生产”这两句对顾客说的话反映了（）A. 生产观念和市场营销观念的区别B. 生产观念和推销观念的区别C. 生态观念和推销观念的区别D. 推销观念和市场营销观念的区别10、下列企业行为中，不属于市场营销活动的是（）A. 产品生产B. 确定价格C. 售后服务D. 人员招聘11、农民王老伯，看到去年姜卖到7块多的价格，心里想我今年要多种些，按照这个价格儿子结婚的房子就不愁了。

一、给带点的字选择正确读音。

（目P 1）奔．向（bèn bēn）杜鹃．（jüan juān）躲．藏（duǒ dǒu）二、划去带点字不正确的读音。

（目P7）花骨．朵（gū gǔ）玫瑰．（gui guī）散．发（sǎn sàn）仍．然（rēng réng）三、选择正确答案，将序号写在括号里。

（目P9）1.下面词语中注音有错误的一项是（）A．山冈（shān gāng） B.唠叨（láo dao） C.仍然（rēng rán）2.下列词语中字形有错误的一项是（）A.感谢B.呼唤C.遥动D.浇花四、给带点字选择正确读音。

（目P18）黑白相间．（jiàn jiān）滴滴答．答（dā dá）待．着（dāi dài）五、在加点字的正确读音下面打“√”。

（目P20）荆．棘（jīn jīng）雷锋．（fōng fēng）黑白相间．（jiān jiàn）簇．拥（chù cù）掀．起（xiān xīn）待．在家里（dāi dài）曾．经（céng zēng）软垫．（diàn jiàn）空．地（kòng kōng）六、根据短文内容从括号里选择正确的字，在字下面画“√”。

（目P24）清晨湖面上（飘漂）着薄薄的雾。

天边的（晨辰）星和山上的点点灯光，隐隐约约的倒映在湖水中。

要是下起蒙蒙细雨，日月潭好像披上（青轻）纱，周围的景物一片朦胧，就像仙境。

七、在加点字的正确读音下面打“√”。

（目P25）梯．田（tī dī）好．客（hǎo hào）水分．（fēn fèn）钉．着（dīng ding）阴．房（yīn yin）碉．堡（diāo zhōu）八、读句子，用“＼”划去带点字不正确的读音。

（目P27）1．、多么幸福啊，1961年的泼．（pō bō）水节！2．春天，天空．（kòng kōng）中飘着蒙蒙细雨。

七年级英语下册英语试题（2014.3.）一、单项选择（每题1分，共15分）1. I can play piano but I can’t play chess.A. the ; theB. / ; /C. the ; /D. / ; the2.— What can she do?— She can Kung fu.A. doB. playC. makeD. help3. Peter often gets up six the morning.A. in; atB. on; atC. at; inD. on; in4. He at 7:00 in the evening.A. get homeB. gets to homeC. gets homeD. goes to home5. It’s ten o’clock. We must go to .A. the bedB. a bedC. bedD. beds6. Tony sits（坐）Tina and Linda.A. amongB. betweenC. onD. next7. He his bike to the bus station.A. byB. onC. ridesD. takes8. —is it from your home to the bus stop?—It’s about 2 kilometers.A. How longB. How farC. How manyD. How much9. Those students go a ropeway cross the river to school.A. on ; forB. on ; withC. on ; toD. for ; to10. Mike is boy.A. one 11-years-oldB. one 11-years oldC. a 11-year-oldD. one 11-year-old11. Can he it in Chinese?A. speakB. speaksC. sayD. talk12. Miss Zhang is good music. She can be good children（儿童）in the music club.A. at ; atB. with ; withC. at ; withD. with ; at13. Please call Mrs. Miller 555-3721.A. onB. atC. inD. with14. — Can you play the drums the guitar?— I can play the drums.A. andB. butC. soD. or15. — What time does your sister go to bed?—.A. On nine past halfB. At half past nine 二、完形填空（每空1分，共10分）David has a happy family. In the 16 he gets up 17 5:30. He 18 a shower and then he eats breakfast at 6 19 . His parents get up at 5:00. They usually take 20 at 5:30.Then they 21 breakfast.In the afternoon David 22 home at 4:30. His parents come home at 5:25. They have dinner at 23 . In the evening, David likes watching TV. But his parents ask him to do 24 homework first. He 25 to bed at 9:00.（）16. A. afternoon B. morning C. evening D. night（）17. A. in B. on C. at D. for（）18. A. take B. have C. takes D. haves（）19. A. clock B. o’clocks C. clocks D. o’clcok（）20. A. walk B. a walk C. shower’s D. shower（）21. A. have B. eats C. has D. eating（）22. A. come B. comes C. go D. going（）23. A. four thirty B. five fifteen C. six D. five（）24. A. he B. David C. their D. his（）25. A. goes B. go C. gos D. going三、阅读理解（每题2分，共20分）（A）People go to work in different ways. Some people go to work on foot because they live near their workplaces. Some people go to work by bike because they live far away from their workplaces, or they like riding bikes. They think it's good for their health. Today more people have private (私人的)cars, so they can go to work in their cars. In the south of China, many people even go to work by boat because water is around their houses. Will people go to work by plane? I think so，if necessary(如果必要的话)．根据短文内容，判断下列句子正(A)误(B)36. All people like to go to work by bike.37. Some people think it's good for their health to go to work by bike.38. Today more people drive to work.39.1n the north of China, many people go to work by boat40.The writer thinks some people will go to work by plane if necessary.（B）My friend, Tom lives a happy life.（1）He usually gets up at 6:00 , then he goes for a walk. At 7:00 he comes back. He brushes his teeth and takes a shower. （2）Then he eats breakfast. After breakfast, he goes shopping（购物）with his friends. （3）他大约十点半到家，and he cooks lunch. After lunch, he goes to the club. He reads books and plays chess. He eats dinner at home at 6:00 pm. （4）the evening he likes watching TV. At around 9:00 pm he goes to bed.根据短文内容，完成下列任务1、对文中（1）处画线部分提问。

七年级英语Unit1-6单元检测题I。

单项选择.(15分)( ) 1. ——I’m OK, thank you.A。

What's this? B。

Hello！ C. How are you?（) 2。

—— It's a backpack.A。

What color is it? B. How are you? C. What’s this in English!（) 3。

—is the jacket? - It's white.A。

What B. What color C。

How（）4。

- Spell it，please. — OK，A。

It’s a ruler。

B。

R–U–L–E–R. C. It’s yellow.（) 5。

—- Helen.A. What’s your name？B。

What’s this？ C. How are you？（) 6. — Nice to meet you, Eric! -A。

Nice to meet you，too B。

How do you do? C. Good afternoon. ( ) 7。

— Is this ruler？—No, it’s——- eraser。

A. an，aB. an, an C。

a，an( ) 8. His name is Jim Smith. Smith is his name.A. English B。

first C。

last（）9. — Is this your key? -A. Yes，it’s.B. No，it isn’t。

C. No, it is。

（) 10。

That my mother。

These my brothers.A。

is, are B. am，are C. are，is( ）11。

- Is the cat ( 猫）the sofa?- No，it isn't。

It's the table。

人教版九年级化学1-6单元综合测试题-CAL-FENGHAI.-(YICAI)-Company One1人教版九年级化学1-6单元综合测试题一、选择题（本题包括14小题，每小题只有一个正确答案，每小题1分，共14分）1.日常生活中发生的下列变化，都属于化学变化的是A．汽油燃烧、轮胎爆炸 B．湿衣服晾干、酒精挥发C．菜刀生锈、火药爆炸 D．将不锈钢制成锅、植物光合作用2.下列实验操作正确的是（）A．加热固体B．倾倒液体C．熄灭酒精灯D．取用固体粉末3.下列各图中“●”和“○”分别表示不同元素的原子，其中表示混合物的是（）A．B．C．D．4.下列有关实验现象的描述，正确的是（）A．红磷在空气中燃烧产生大量白雾 B．木炭在空气中燃烧生成二氧化碳C．硫在空气中燃烧发出蓝紫色火焰 D．铁丝在氧气中燃烧生成黑色固体5.对下列事实的微观解释正确的是（）选项事实解释A金刚石的硬度远大于石墨碳原子结构不同B蔗糖溶液不能导电溶液中没有自由移动的粒子C6000L氧气在加压的情况下可装入容积为40L钢瓶中氧分子变小了D稀盐酸、稀硫酸均显酸性溶液中都含有氢离子A．A B．B C．C D．D6.下列图示的实验操作中，正确的是（）A．点燃酒精灯 B．过滤 C．量5.5mL液体 D．称量10.05g固体7.关于电解水实验的下列说法中正确的是（）A．从现象上判断：正极产生的是氢气 B．从变化上分类：该变化属于物理变化C．从宏观上分析：水是由氢气和氧气组成的 D．从微观上分析：水分子是由氢原子和氧原子构成的8.下列化学符号中数字“2”表示的意义，正确的是（）A．SO2：表示二氧化硫中含有2个氧原子 B．2Fe：表示2个铁原子C．：表示一个镁离子带2个单位正电荷 D．S2﹣：表示硫元素的化合价为﹣2价9.煤油中含有噻吩（用X表示），噻吩具有令人不愉快的气味，其燃烧时发生反应的化学方程式表示为：X+6O24CO2+SO2+2H2O，则噻吩的化学式为（）A．C4H4S B．C4H6S C．CH4D．C4H8S10.关于下列符号或图示的有关说法正确的是（）A．①表示两个氧原子 B．②和④均表示阳离子C．③和⑤所表示的微粒化学性质相似 D．由⑥可知碘的相对原子质量为126.9g11.在一个密闭容器中放入X、Y、Z、W在一定条件下发生化学反应，一段时间后，测得有关数据如下表。

九年级化学月考试卷试卷可能用到的相对原子质量：H ：1 C ：12 O ：16 Mg ：24 Zn ：65 一、选择题（本题包括12个小题，每小题1分，共12分）1、生活中的下列变化属于物理变化的是（ ） A ． 粮食酿酒 B ． 铁钉生锈 C ． 蜡烛燃烧 D ． 水的蒸发2、下列关于氧气的说法正确的是A ．氧气能支持燃烧，可以作燃料B ．氧气能跟所有物质发生氧化反应C.水中的生物能依靠微溶于水中的氧气而生存 D ．带火星的木条一定能在含氧气的集气瓶燃烧 3．下列各项中，不属于我国《环境空气质量标准》基本监控项目的是（ ） A ． 二氧化硫浓度 B ． 氮气浓度 C ． 二氧化氮浓度 D ． P M2.5浓度 4、有元素化合价升降的反应是氧化还原反应。

下列属于氧化还原反应的是 ( ) A ．CaCO 3=高温CaO + CO 2↑ B ．HCl+ KOH = KCl+ H 2O C ．SO 2 +2NaOH = Na 2SO 3+H 2O D ．2Na +2H 2O = 2NaOH+ H 2↑ 5、相同质量的H 2、CH 4和CO 完全燃烧需要氧气的质量 ( ) A ．CO 最多，H 2最少 B ．H 2最多，CH 4最少 C ．H 2最多，CO 最少 D ．CH 4最多，CO 最少6、下列物质在氧气中燃烧，生成物是黑色固体的是 ( ) A 、木炭 B 、铁丝 C 、镁带 D 、红磷7．如图有关O 2和CO 2的自述中属于物理性质的是 ( )8、．分子、原子、离子等都是构成物质的微粒．下列物质由离子构成的是（ ） A ． 氯化钠 B ． 黄金 C ． 金刚石 D ． 干冰测得反应前后各物质的质量如下表所示，下列说法错误的是 （ ） 物质氧气 二氧化碳 水蒸气 W 反应前的质量／g 50 1 1 2 3 反应后的质量／g24528xA.物质W 只含碳和氢两种元素B.物质W 可能含碳、氢、氧三种元素C.根据质量守恒定律，x 的值为0D.反应后的生成物是二氧化碳和水10、已知某两种物质在一定条件下能发生化学反应，其反应的微观示意图如下，则下列说法中，正确的是 （ ）（说明：一种小球代表一种元素的原子）A．图中的反应物都是化合物B．该反应属于分解反应C．该反应属于化合反应D．该反应符合质量守恒定律11.下列关于水的说法中不正确的是（）A.利用肥皂水可以区分硬水与软水B.通常把含有较多可溶性钙、镁化合物的水叫硬水C.通过煮沸的方法，一般可以降低水的硬度D.生活中常利用活性炭的吸附性来降低水的硬度12、二甲醚（C2H6O）具有清洁无污染，易于制造的特性，将有望成为一种全新的替代能源，在国内实现普及。

Unit 1-6单元综合测试题I、单项选择( )1. Can you ______ English?A. speakB. talkC. sayD. tell( )2. --- ________ can you play? --- The drums.A. WhenB. HowC. WhatD. Where( )3. --- ______ you sing? --- Yes, I can.A. DoB. CanC. AreD. Am( )4. I want to ______ the chess club.A. joinB. join inC. join toD. join for ( )5. Tom wants ________ to you. Are you free?A．to tell B．tells C．to talk D．talks ( )6. Can you help me with _______?A. danceB. dancingC. dancesD. to dance( )7. —What club ______ you want to join?—Chess club.A. doesB. doC. canD. are( )8. Her sister can play ______ piano, but she can’t play _____ basketball.A. the; theB. /; theC. the; /D. /; / ( )9. My brother can play the guitar，______ he can’t play it very well.A. andB. soC. orD. but ( ) 10. —Can you play volleyball? —Sorry, I ______.A. don’tB. doC. can’tD. can( )11. -- did you come here? -- boat.A. How, ByB. How long, ByC. How, Take( )12. Health your healthy lifestyle.A. dependsB. decidesC. depends on( )13. In North America, most students go to school the school bus.A. byB. takeC. on( )14. My parents are my home in three days.A. reaching toB. arriving inC. getting to( )15. –How does it take? –It takes about 10 minutes’.A. long, walkB. long, to walkC. far, walking( )16. The passage is very hard because there are many new words in it.A. veryB. soC. such( )17. She often a bike to the school.A. takesB. drivesC. rides( )18. The weather in Beijing is that in Changsha.A. far fromB. same asC. different from ( )19. The old woman is her lost son.A. worried aboutB. worryC. worried( )20. do you the transportation in your town?A. What, thinkB. How, think ofC. What, thinkUnit 3-4单元综合测试题一、从下面四个选项中选出最佳选项。

【名校尖子生】初中化学创新能力培优竞赛题（五） 1-6单元一、选择题1．下列物质的用途，既利用了物理性质，又利用了化学性质的是（）A．农村用沼气作燃料B．用活性炭来除掉冰箱中的异味C．CO2用来灭火D．盐酸用于除水垢【答案】C【解析】A、用沼气作燃料，是因为沼气具有可燃性，可燃性是沼气的化学性质。

B、用活性炭来除掉冰箱中的异味，是利用了活性炭的吸附性，吸附性是活性炭的物理性质。

C、CO2用来灭火的原因一是二氧化碳密度比空气大，这是物理性质；二是不燃烧也不支持燃烧，这是化学性质。

D、盐酸用于除水垢，是盐酸能与水垢发生化学反应，这是利用了盐酸的化学性质。

故答案为：C。

【分析】根据物理性质化学性质定义分析，物理性质是不需要通过化学变化表现出来的性质，化学性质是需要通过化学变化表现出来的性质。

2．北京冬奥会速滑馆用二氧化碳跨临界直冷技术来制人造冰。

下列关于液态二氧化碳汽化制冰的说法正确的是（）A．液态二氧化碳汽化放热，使水凝结成冰B．水凝结成冰后，分子停止了运动C．二氧化碳汽化时，分子间隔变小了D．二氧化碳汽化时，分子没有发生改变【答案】D【解析】A、液态二氧化碳汽化吸热，使水凝结成冰，不符合题意；B、水凝结成冰后，分子仍在运动，因为分子总是在不停地运动，不符合题意；C、二氧化碳汽化时，由液态变为气态，体积增大，故分子间隔变大了，不符合题意；D、二氧化碳汽化是物质的状态变化，属于物理变化，所以分子没有发生改变，符合题意。

故答案为：D。

【分析】A.液态二氧化碳汽化时吸热，可以使温度降低，用来制作人造冰；B.水凝结成冰后水分子依然在不断地运动；C.二氧化碳汽化时，分子间隔变大了；D.二氧化碳汽化时，只是物质的形态发生了变化，没有生成新物质，属于物理变化。

3．“归纳与比较”是化学学习的主要方法，下列关于CO2 与CO的不同点比较错误的是（）A．组成：一个二氧化碳分子比一个一氧化碳分子多一个氧原子B．性质：CO2能溶于水，水溶液呈酸性；CO难溶于水，但能燃烧C．用途：CO2可用于光合作用、灭火等；CO可作气体燃料，还可用于人工降雨D．危害：CO2会造成“温室效应”；CO易与血液中的血红蛋白结合引起中毒【答案】C【解析】因为CO2与CO的分子构成不同，所以二者具有不同的性质，根据其不同的性质又决定它们有不同的用途以及造成的危害．A、从化学式上看出，1个二氧化碳分子比1个一氧化碳分子多1个氧原子，故此项说法正确；B、CO2与CO都是无色无味的气体，但一氧化碳不溶于水，也不和碱溶液反应，但具有可燃性；二氧化碳不能燃烧，但能溶于水生成碳酸，故此项说法正确；C、CO2与CO的性质决定它们有这些用途，CO2可用于光合作用、灭火、化工产品的原料和气体肥料，“干冰”可用于人工降雨等；CO可用作气体燃料、冶炼金属的还原剂等，故此项说法错误；D、二氧化碳是温室气体会造成“温室效应”；CO极易与血液中的血红蛋白结合引起煤气中毒，故此项说法正确．故选：C．4．科学家在制备碳纳米管时得到了一种由碳原子构成的副产品，该副产品外观类似泡沫、质地轻盈，被称为碳纳米泡沫，它的发现极大地推动了碳素材料的研究。