20篇专四完形填空专项训练

专四 英语 完形填空

Many students find the experience of attending university lectures to be a confusing and frustrating experience. The lecturer speaks for one or two hours, perhaps __1__ the talk with slides, writing up important information on the blackboard, __2__ reading material and giving out __3 __. The new student sees the other students continuously writing on notebooks and __4__ what to write. Very often the student leaves the lecture __5__ notes which do not catch the main points and __6__ become hard even for the __7__ to understand. Most institutions provide courses which __8__ new students to develop the skills they need to be __9__ listeners and note-takers. __10__ these are unavailable, there are many useful study-skills guides which __11__ learners to practice these skills __12__ . In all cases it is important to __13__ the problem __14__ actually starting your studies. It is important to __15__ that most students have difficulty in acquiring the language skills __16__ in college study. One way of __17__ these difficulties is to attend the language and study-skills classes which most institutions provide throughout the __18__ year. Another basic __19__ is to find a study partner __20__ it is possible to identify difficulties, exchange ideas and provide support.

1.A.extending B.illustrating C.performing D.conducting

2.A.attributing B.contributing C.distributing D.explaining

3.A.assignments rmation C.content D.definition

4.A.suspects B.understands C.wonders D.convinces

5.A.without B.with C.on D.except

6.A.what B.those C.as D.which

7.A.teachers B.classmates C.partners D.students

8.A.prevent B.require C.assist D.forbid

9.A.effective B.passive C.relative D.expressive

10.A.Because B.Though C.Whether D.If

11.A.enable B.stimulate C.advocate D.prevent

12.A.independently B.repeatedly C.logically D.generally

13.A.evaluate B.acquaint C.tackle D.formulate

14.A.before B.after C.while D.for

15.A.predict B.acknowledge C.argue D.ignore

16.A.to require B.required C.requiring D.are required

17.A.preventing B.withstanding C.sustaining D.overcoming

18.A.average B.ordinary C.normal D.academic

19.A.statement B.strategy C.situation D.suggestion

20.A.in that B.for which C.with whom D.such as

专四 英语 完形填空

Most people have no idea of the hard work and worry that gosintosthe collecting of those fascinating birds and animals that they pay to see in the zoo. One of the questions that is always asked of me is __1__ I became an animal collector in the first __2__ . The answer is that I have always been interested in animals and zoos. According to my parents, the first word I was able to say with any __3__ was not the conventional “mamma” or “daddy”,__4__ the word “zoo”, which I would __5__over and over again with a shrill __6__ until someone, insgroupsto __7__ me up, would take me to the zoo. When I __8__ a little older, we lived in Greece and I had a great __9__ of pets, ranging from owls to seahorses, and I spent all my spare time __10__ the countryside in search of fresh specimens to __11__ to my collection of pets.__12__ on I went for a year to the City Zoo, as a student __13__ , to get experience of the large animals, such as lions, bears, bison and ostriches,__14__ were not easy to keep at home. When I left, I __15__ had enough money of my own to be able to __16__ my first trip and I have been going __17__ ever since then. Though a collector’s job is not an easy one and is full of __18__ ,it is certainly a job which will appeal __19__ all those who love animals and __20__ .

1. A.how B.where C.when D.whether

2. A.region B.field C.place D.case

3. A.clarity B.emotion C.sentiment D.affection

4. A.except B.but C.except for D.but for

5. A.recite B.recognize C.read D.repeat

6. A.volume B.noise C.voice D.pitch

7. A.close B.shut C.stop fort

8. A.grew B.was growing C.grow D.grown

9. A.many B.amount C.number D.supply

10. A.living B.cultivating C.reclaiming D.exploring

11. A.increase B.include C.add D.enrich

12. ter B.further C.then D.subsequently

13. A.attendant B.keeper C.member D.aide

14. A.who B.they C.of which D.which

15. A.luckily B.gladly C.nearly D.successfully

16. A.pay B.provide C.allow D.finance

17. A.normally B.regularly ually D.often

18. A.expectations B.sorrows C.excitement D.disappointments

19. A.for B.with C.to D.from

20. A.excursion B.travel C.journey D.Trip

专四 英语 完形填空

3．

If you were to begin a new job tomorrow, you would bring with you some basic strengths and weaknesses. Success or __1 __ in your work would depend, to __2 __ great extent, __3 __ your ability to use your strengths and weaknesses to the best advantage. __4 __ the utmost importance is your attitude. A person __5 __ begins a job convinced that he isn’t going to like it or is __6 __ that he is going to ail is exhibiting a weakness which can only hinder his success. On the other hand, a person who is secure __7 __ his belief that he is probably as capable __8 __ doing the work as anyone else and who is willing to make a cheerful attempt __9 __ it possesses a certain strength of purpose. The chances are that he will do well。 __10 __ the prerequisite skills for a particular job is strength. Lacking those skills is obviously a weakness.

A bookkeeper who can’t add or a carpenter who can’t cut a straight line with a saw __11 __ hopeless cases. This book has been designed to help you capitalize __12 __ the strength and overcome the __13 __ that you bring to the job of learning. But in groups to measure your development, you must first __14 __stock of somewhere you stand now. __15 __ we get further along in the book, we’ll be __16 __ in some detail with specific processes for developing and strengthening __17 __ skills. However, __18 __ begin with, you should pause __19 __ examine your present strengths and weaknesses in three areas that are critical to your success or failure in school: your __20 __ , your reading and communication skills, and your study habits.

1.A.improvement B.victory C.failure D.achievement

2.A.a B.the C.some D.certain

3.A.in B.on C.of D.to

4.A.Out of B.Of C.To D.Into

5.A.who B.what C.that D.which

6.A.ensure B.certain C.sure D.surely

7.A.onto B.on C.off D.in

8.A.to B.at C.of D.for

9.A.near B.on C.by D.at

10.A.Have B.Had C.Having D.Had been

11.A.being B.been C.are D.is

12.A.except B.but C.for D.on

13.A.idea B.weakness C.strength D.advantage

14.A.make B.take C.do D.give

15.A.as B.till C.over D.out

16.A.deal B.dealt C.be dealt D.dealing

17.A.learnt B.learned C.learning D.learn

18.A.around B.to C.from D.beside

19.A.to B.onto C.into D.with

20.A.intelligence B.work C.attitude D.weakness

专四 英语 完形填空

4．

Who won the World Cup 1994 football game? What happened at the United Nations? How did the critics like the new play? __1__ an event takes place; newspapers are on the streets __2__ the details. Wherever anything happens in the world, reports are on the spot to __3__ the news. Newspapers have one basic __4__ , to get the news as quickly as possible from its source, from those who make it to those who want to __5__ it.Radio, telegraph, television, and __6__ inventions brought competition for newspapers. So did the development of magazines and other means of communication. __7__ , this competition merely spurred the newspapers on.

They quickly made use of the newer and faster means of communication to improve the __8__ and thus the efficiency of their own operations. Today more newspapers are __9__ and read than ever before. Competition also led newspapers to branch out to many other fields. Besides keeping readers __10__ of the latest news, today's newspapers __11__ and influence readers about politics and other important and serious matters. Newspapers influence readers' economic choices __12__ advertising. Most newspapers depend on advertising for their very __13__ .Newspapers are sold at a price that __14__ even a small fraction of the cost of production. The main __15__ of income for most newspapers is commercial advertising. The __16__ in selling advertising depends on a newspaper's value to advertisers. This __17__ in terms of circulation. How many people read the newspaper? Circulation depends __18__ on the work of the circulation department and on the services or entertainment __19__ in a newspaper's pages. But for the most part, circulation depends on a newspaper's value to readers as a source of information __20__ the community, city, country, state, nation, and world—and even outer space.

1.A.Just when B.While C.Soon after D.Before

2.A.to give B.giving C.given D.being given

3.A.gather B.spread C.carry D.bring

4.A.reason B.cause C.problem D.purpose

5.A.make B.publish C.know D.write

6.A.another B.other C.one another D.the other

7.A.However B.And C.Therefore D.So

8.A.value B.ratio C.rate D.speed

9.A.spread B.passed C.printed pleted

rm B.be informed C.to be informed rmed

11.A.entertain B.encourage C.educate D.edit

12.A.on B.through C.with D.of

13.A.forms B.existence C.contents D.purpose

14.A.tries to cover B.manages to cover C.fails to cover D.succeeds in

15.A.source B.origin C.course D.finance

16.A.way B.means C.chance D.success

17.A.measures B.measured C.Is measured D.was measured

18.A.somewhat B.little C.much D.something

19.A.offering B.offered C.which offered D.to be offered

20.A.by B.with C.at D.about

专四 英语 完形填空

1.【答案】A

【解析】just在此为副词，意为“刚刚”，做状语。此句意为“一个事件刚刚发生，街上就有报纸报道详情了。说明报纸对新闻的反应之快。

2.【答案】A

【解析】to give和giving都合乎语法，但giving强调的是正在发生的动作，而此处重点表达的是“反应快”，不是正在做什么。

3.【答案】A

【解析】消息，信息要靠收集。

4.【答案】D

【解析】后面的不定式短语表示目的。

5.【答案】C

【解析】提供信息的目的是为了让他人知道，所以选C。

6.【答案】B

【解析】other意为“其他的”。此句意为：无线电，电报，电视，及其它发明，成为报纸的竞争对手。

7.【答案】A

【解析】根据句中的merely及其后所述内容，应选however，表转折。

8.【答案】D

【解析】使用更新，更快的通讯工具，目的是提高速度。

9.【答案】C

【解析】报纸是印出来的，先印后看(读)。

10.【答案】D

【解析】keep sb.+过去分词是一种复合结构，sb.与过去分词为被动关系，意为保持这种关系的继续。此句的意思是：报纸不断地为读者提供新闻信息。

11.【答案】C

【解析】关于politics之类的严肃话题,只能选educate。

12.【答案】B

【解析】此句意为：报纸通过广告影响读者在经济生活中的选择。

13.【答案】B

【解析】大多数报纸依靠广告收入来维持生存，此现象人人皆知。

14.【答案】C

【解析】报纸的售价之低，不足以抵付成本的一小部分。符合上下文关于广告收入的说法。

15.【答案】A

【解析】收入来源应该用source。因为source指河流，泉水的发源地；常指抽象事物的根源或来源以及资料，信息的出处或来源。origin起源，起因。指事物后来发生,发展变化的最初起点,或指人的出身和血统。

16.【答案】D

【解析】succeed in为固定短语。此句意为：广告业务的成功，取决于报纸在客户(要打广告的人)心中的价值。

17.【答案】C

【解析】根据上下文，此处应该用一般现在时的被动语态，此句意为：报纸在客户心中的价值，是靠发行量衡量的。

18.【答案】C

专四 英语 完形填空

【解析】该句意为：发行量的大小，很大程度上取决于发行部门的工作及报纸所提供的服务功能和娱乐功能。

19.【答案】B

【解析】offered作services和entertainment的定语。

20.【答案】D

【解析】information后面接介词about，表示“关于”。

专四 英语 完形填空

5．

Fire can help people in many ways. Fire can heat water, (1)____ your house, give light and cook food. But fire can burn things too. Nobody knows (2)____ people began to use fire. One story from Australia tells about a man a very long time ago. He (3)____ the sun by a rope and brought fire down.

Today people know how to (4)____ a fire with matches. Children sometimes like to play with them. But matches can be very (5)____.

Fire kills people every year. So you must be careful (6)____ matches. You should also learn to

(7)____ fires. Fires need oxygen. Without oxygen they die. There is (8)____ in the air. Cover a fire with water, sand, or (9)____, with your coat or a blanket. This keeps the air from a fire and kills it. Be careful with fire, and it will help you. Be careless with fire, and it might (10)____ you.

1. A. brighten B. warm C. beautify D. lighten

2. A. where B. when C. what D. how

3. A. watched B. got up to C. went up to D. discovered

4. A. set B. make C. cause D. catch

5.A. dangerous B. bright C. unusual D. common

6. A. about B. to C. On D. after

7. A. lay out B. put out C. put away D. do away with

8. A. fire B. moisture C. oxygen D. substance

9. A. in general B. in particular C. in a hurry D. in an emergency

10. A. injure B. hurt C. destroy D. spoil

专四 英语 完形填空

答案：1. B 2. D 3. C 4. B 5. A 6. A 7. B 8. C 9. D 10. B

专四 英语 完形填空

6.

Here is another program in the series, "Famous Personalities (个性)." This afternoon I am going to talk (1)____ the famous film director, Daniel Z. Sloman. Dan Sloman doesn’t need any introduction from me. He has directed "Goodbye to Boston", "Pacific Story" and many other famous films. "Tell me, Dan, have you ever directed a film in England?"

"Why, yes, Peter. I directed ’Green Years’ here."

"Oh course. How long (2)____ was that, Dan?"

"That was five years ago. That film was about life in an English village."

"What can you remember about this (3)____, Dan?"

"Lots of things, Peter. When we were filming in the open, it usually (4)____ to rain!" "You rebuilt half the village, I believe, Dan."

"That’s right, Peter. We built a (5)____ over the river. We put a few buildings. (6)____ our men were working, half the (7)____ watched us."

"Were the villagers against the film?"

"Oh, no. Many villagers (8)____ a lot of money. Thousands of tourists came to the village. The place (9)____ famous."

"Have you ever been back to the village since then?"

"I can’t say I have, Peter. But I remember it well."

"What else do you remember about the film, ’Green Years’, Dan?"

"Well, I remember the actors, of course. In one scene we (10)____ a thousand ’extras’." "And you used the villagers."

"That’s right, Peter. There were 2000 men, women and children in the village and we used a thousand of them. Every man has his price. We paid each villager fifty pence to take part in the film."

"What about the villagers that weren’t in the film?"

"They came to watch."

"What happened then?"

"It was very funny, Peter. We couldn’t keep them out of it. We paid half the villagers fifty pence each to act in the film. And we paid the other half of the villagers five pounds each not to join in the film! But it was a great scene. I’ll never forget it."

"Thank you, Dan."

1. A. to B. about C. for D. into

2. A. before B. ago C. after D. since

3. A. life B. village C. year D. film

4. A. begins B. began C. had started D. beginning

5. A. road B. way C. village D. bridge

6. A. As soon as B. After C. Before D. While

7. A. town B. city C. village D. country

8. A. made B. took C. carried D. brought

9. A. is B. gets C. became D. get

10. A. asked B. dismissed C. needed D. told

专四 英语 完形填空

答案： 1. A 2. B 3. D 4. B 5. D 6. D7. C 8. A 9. C 10. C

7.

A land free from destruction, plus wealth, natural resources, and labor supply—all these were important 1 in helping England to become the center for the Industrial Revolution. 2 they were not enough. Something 3 was needed to start the industrial process. That "something special" was men—4 individuals who could invent machines, find new 5 of power, and establish business organizations to reshape society.

The men who 6 the machines of the Industrial Revolution 7 from many backgrounds and many occupations. Many of them were 8 inventors than scientists. A man who is a 9 scientist is primarily interested in doing his research 10 .He is not necessarily working 11 that his findings can be used.

An inventor or one interested in applied science is 12 trying to make something that has a concrete use. He may try to solve a problem by 13 the theories 14 science or by experimenting through trial and error. Regardless of his method, he is working to obtain a 15 result: the construction of a harvesting machine, the burning of a light bulb, or one of 16 other objectives.

Most of the people who 17 the machines of the Industrial Revolution were inventors, not trained scientists. A few were both scientists and inventors. Even those who had 18 or no training in science might not have made their inventions 19 a groundwork had not been laid by scientists years 20 .

1.A.cases B.reasons C.factors D.situations

2.A.But B.And C.Besides D.Even

3.A.else B.near C.extra D.similar

4.A.generating B.effective C.motivating D.creative

5.A.origins B.sources C.bases D.discoveries

6.A.employed B.created C.operated D.controlled

7.A.came B.arrived C.stemmed D.appeared

8.A.less B.better C.more D.worse

9.A.genuine B.practical C.pure D.clever

专四 英语 完形填空

10.A.happily B.occasionally C.reluctantly D.accurately

11.A.now B.and C.all D.so

12.A.seldom B.sometimes C.all D.never

13.A.planning ing C.idea D.means

14.A.of B.with C.to D.as

15.A.single B.sole C.specialized D.specific

16.A.few B.those C.many D.all

17.A.proposed B.developed C.supplied D.offered

18.A.little B.much C.some D.any

19.A.as B.if C.because D.while

20.A.ago B.past C.ahead D.before

专四 英语 完形填空

1.【答案】C

【解析】从这四个词的意思上来区分，case是“事例，案例”的意思，reason表原因，factor意为“因素”，situation的意思是“形势，状况”，文中句子的意思是上述条件是使英国成为工业革命中心的重要因素。故选C.factor。

2.【答案】A

【解析】根据上下句的意思，应选一个表转折的连词，只有A.but符合题意。

3.【答案】A

【解析】else意为“其他，别的”，如：What else can I say?别的我还能说些什么呢？extra意为“额外的，外加的”，如：an extra loaf of bread多加的一条面包，而这句话要表达的是“也需要其他条件”，而不是“额外条件”，排除C.extra。near和similar意思相差较远，故选A。

4.【答案】D

【解析】根据下句的解释，应选“有创造性的”，creative符合题意。generating (产生的、生产的)、motivating (有动机的)和effective(有效的)意思上不贴切。

5.【答案】B

【解析】sources意为“来源，根源”，如，sources of power意为“能源”。符合题意。origin的意思是“起因，由来”。如：the origin of a river河流的源头；base是“基础”的意思；discovery是“发现”的意思。

6.【答案】B

【解析】根据句子的意思，应选create“创造，发明”这个词。

7.【答案】A

【解析】come from的意思是“出自，来自”，与后面background搭配,意为“出于 背景”。stem from意为“起源于”，如：Her interest in books stems from her childhood.她对书本的兴趣是从童年开始的。B、C项的意思不对。

8.【答案】C

【解析】more than 是固定搭配，意为“与其说 不如 ”。本句的意思是,“与其说是科学家,不如说是发明家”。

9.【答案】C

【解析】pure的意思是“纯粹的，单纯的”，genuine的意思是“真正的”，practical的意思是“实际的”，clever的意思是“聪明的”,句子的意思是“一个单纯的科学家主要

专四 英语 完形填空

致力于精确的科学研究。”

10.【答案】D

【解析】accurately的意思是“精确的”,符合题意。Happily(愉快的)；occasionally(时而的，偶然的)和reluctantly(勉强的)均不合题意。

11.【答案】D

【解析】so that是固定搭配，表目的。

12.【答案】C

【解析】这句话的意思是“一个发明家或热衷于应用科学的人通常试图创造有使用价值的东西。”

13.【答案】B

【解析】这句话的意思是“通过运用科学理论”，use意为“使用,运用”,故选B。

14.【答案】A

【解析】theories of science的意思是“科学的理论”。

15.【答案】D

【解析】根据句子的意思，“他为了明确的结果而工作”，specific的意思是“明确的”,specialized的意思是“专门的”; sole的意思是“独有的，单一的”；single的意思是“单独的,一个人”。

16.【答案】C

【解析】根据题意，one of many other objectives“许多其他东西中的一种”。all,全部; few,几乎没有; those,那些;均不合题意。

17.【答案】B

【解析】develop (使)发展。如：to develop a business,发展业务。另一个意思是“研制、开发”，用在这里恰当。如：Many new products have been developed to meet the needs of the people.开发了许多新产品以满足人们的需要。Propose建议。如：I propose resting for half an hour.我提议休息半个小时。Supply提供、供应。如：The government supplies free books to schools.政府为学校免费提供图书。Offer提供，出价。如：Will you offer the guests some coffee.你能给客人准备些咖啡吗？

18.【答案】A

【解析】本题要求选用的适与no意义相近的不定代词，在四个选项中，只有A) little的意思是“几乎没有”,后接不可数名词，符合题意。

专四 英语 完形填空

19.【答案】B

【解析】本题要求填入的是一个连词，用来连接一个表示与过去事实相反的虚拟条件句。本句的意思是说：“如果没有科学家早年打下的基础，那些在科学上接受过很少或没有接受过教育的人就不可能有所发明创造”。if的意思是“如果，假使”，通常用在虚拟条件句中。

20.【答案】D

【解析】本题要求填入的副词用来修饰一个过去完成时的谓语动词，即表示过去某个时间以前发生的动作，因而只能用D)before。如：He would not have achieved so much in the research if he had not studied chemistry years before.如果他早年没学过化学的话，他在这项研究中就不可能取得这么大的成绩。Ago只与一般过去时连用，表示从现在角度看过去的某一时间。如：He studied chemistry many years ago.他好多年前学过化学。

专四 英语 完形填空

8.

To others and themselves the British have a reputation for being conservative——not in the narrow political sense, but in the sense of adherence to accepted ideas and unwilling to question them.The reputation comes partly from their 900 have suffered nor revolution (except in 1688) nor disastrous defeat in .Their monarchy (君主政体) survives question.Under its normal political arrangements have been stable that, except for the in the seventeenth , they have been adopted throughout social and economic as well but the quarrels had been usually nguage B.future C.history D.literature

2.A.centuries B.years C.minutes

3.A.neither B.as C.or D.either

C.or D.and D.seconds 4.A.too B.but

5.A.home B.study C.peace D.war

6.A.and B.without C.with D.neither

B.people C.leadership D.enemy

8.A.so B.very C.too D.such

9.A.two B.one C.no D.couple

C.year D.century 10.A.month B.day

11.A.a B.any C.the D.few

12.A.changes B.change C.altered D.changed

mon B.popular C.unique D.angry

14.A.two B.a C.some D.their

15.A.survive B.surviving

16.A.bitter C.survives D.survived B.happy C.pleasant D.unhappy

17.A.for B.as C.to D.at

18.A.settling B.settles C.settle D.settled

19.A.for B.at C.to D.by

20.A.continue B.continuity C.continuous D.continued

专四 英语 完形填空

1.【答案】C

【解析】由于下文紧接着叙述到过去900年的有关情况。故应选history，才能与下文衔接。

2.【答案】B

【解析】根据句子意思判断。

3.【答案】A

【解析】应选neither才能与其后出现的nor构成并列连词neither nor 。

4.【答案】D

【解析】根据句子意思判断。

5.【答案】D

【解析】需选一名词与前面的介词in构成介词短语，且这个短语在语意上要与前面的disastrous defeat相吻合。故选D可以满足这个条件。

6.【答案】B

【解析】without serious question意为“没有严重的问题”。

7.【答案】C

【解析】“在 领导下”的表达方式是under the leadership.

8.【答案】A

【解析】so that 构成固定短语，意为“这么 以致于”

9.【答案】A

【解析】上面提到1649和1688两次革命，所以A项正确。

10.【答案】D

【解析】根据句子意思判断。

11.【答案】C

【解析】the centuries特指那些稳定的世纪。

12.【答案】A

【解析】应从A或B中选一名词作介词without的宾语。将A和B加以比较：A.changes作可数名词用，意为“变化”，符合题意。B.change一词系不可数名词，意为“零钱，找头”。

13.【答案】C

【解析】根据上下文意思,应选unique“独一无二的；唯一的”。

14.【答案】B

专四 英语 完形填空

【解析】没有一项成文宪法，a为一项的意思。

15.【答案】D

【解析】应选survived才与上下文时态一致。

16.【答案】A

【解析】bitter意为“尖锐的，厉害的”。

17.【答案】B

【解析】as well as为一并列连词。

18.【答案】D

【解析】settled符合语法要求。

19.【答案】D

【解析】by compromise意为“通过折衷、妥协的办法”。如：We should settle our differences by compromise.我们应采取折衷的办法来解决我们之间的分歧。

20.【答案】B

【解析】四个选项中，只有名词continuity正确。

专四 英语 完形填空

9.

Dalton wondered why the heavier and lighter gases in the atmosphere did not separate as oil uniform so form more complex substance; the mystery of this law was .Dalton suggested, for example, that carbon monoxide formed bythe one with one atoms of compounds the different constituents in unvarying proportions) would naturally the 1.A.gases B.pieces C.things D.gas

2.A.timely

3.A.ought B.trimmed C.tiny D.topical B.could C.will D.must

4.A.sky B.atmosphere C.oxygen D.environment

5.A.various B.many C.the

C.that D.those 6.A.only B.too

7.A.should D.extremely D.could B.were C.get

8.A.construct B.structure

9.A.but B.also C.thus C.piece D.feature D.nevertheless

10.A.solved B.discovered C.broked D.told

11.A.must B.been C.were D.is

12.A.putting B.pairing C.placing D.preparing

13.A.while

14.A.piece

15.A.from B.when C.therefore B.type D.also C.atom D.measure B.in C.of D.for

16.A.then B.so C.by D.that

17.A.from B.in C.to D.for

C.always D.never

C.mix D.reveal 18.A.are B.wouldn’t 19.A.describe B.unit

20.A.different ual C.important D.chemical

专四 英语 完形填空

1.【答案】A

【解析】根据上文中的heavier and lighter gases可以确定,本空中应填入“组成的气体”，即constituent gases。

2.【答案】C

【解析】根据句子意思判断,句中的词意为微粒的意思，选项C.tiny合乎题意。

3.【答案】D

【解析】情态动词must在这里是“必定、必须”的意思。

4.【答案】B

【解析】sky意为“天空”，atmosphere意为“大气”, oxygen意为“氧气”, environment意为“环境”,只有B项正确。

5.【答案】C

【解析】这帮助解释了大气组成气体的比例确定原理。因为是特指这一原理，用定冠词the。

6.【答案】A

【解析】only necessary的意思是“仅仅是必要”。故A正确。

7.【答案】D

【解析】根据句子意思判断, could是“能够”的意思。

8.【答案】B

【解析】根据句子意思判断,这里需要“结构”这个词，而B合乎题意。

9.【答案】C

【解析】but，nevertheless表示转折意为“但是”，“然而”；thus意为“因此”，如There has been no rain.Thus, the crops are likely to suffer.一直没有下雨，因此庄稼可能会受害。这里与上文有因果关系，故应选C。

10.【答案】A

【解析】solve相当于find a solution or an answer to,意为“解决”、“解开”,如: solve a problem (a puzzle, a mystery)；discover相当于find something existing but not known before,意为“发现”,如: discover a place (a fact, the truth)。因此应选A。

11.【答案】D

【解析】因为是表一般规律，又是单数，所以用is这个词。

12.【答案】B

专四 英语 完形填空

【解析】Pair这里是“匹配，配成双”的意思。

13.【答案】A

【解析】while表示对比。如：Some substances are soluble, while others are not.一些物质是可溶的，而另一些物质是不可溶的。

14.【答案】C

【解析】根据句子意思判断, atom正确。

15.【答案】C

【解析】of表示“含量，分量”。

16.【答案】A

【解析】then的意思是next, after that。

17.【答案】D

【解析】for的意思是“对于，就 而言”。

18.【答案】C

【解析】根据句子意思判断。

19.【答案】B

【解析】describe意为“描述”；unite意为“结合，合并”；mix意为“(不同的东西)混合在一起”，如：mix flour and water；reveal意为“揭露，揭示”。

20.【答案】A

【解析】根据句子意思判断.

专四 英语 完形填空

10.

The rocket engine, with its steady roar like that of a waterfall or a thunderstorm, is an impressive symbol of the new space age.Rocket engines have enough to shoot Impressive and complex 5 it may appear, the rocket, which was 6 in China over 800 years 7 , by Sir Isaac Newton when he discovered that“ opposite reaction.”

1.A.shown

2.A.against B.been C.appeared D.proved B.despite C.beyond D.from

C.take D.carry 3.A.send nd

4.A.travelers B.astronauts C.researchers D.explorers

5.A.that B.so C.as D.sometimes

6.A.made B.discovered C.developed D.invented

7.A.in advance

8.A.round

9.A.as B.before C.earlier D.ago B.contained C.stored D.burned C.for D.the

C.expanding D.conducting B.into 10.A.heating B.escaping

11.A.in B.at C.by D.through

12.A.turns B.goes C.faces D.directs

B.dispersed C.erected D.radiated 13.A.transmitted

14.A.attracts B.leads C.pulls D.pushes

15.A.same B.other C.opposite D.wrong

16.A.that B.when C.if D.although

17.A.states B.proves C.follows D.breaks

B.discussed C.considered D.made

D.for 18.A.described 19.A.like B.as C.with

20.A.no B.an C.another D.theCloze

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