1、(31)Ballpoint pens have made life easier for millions of people. At one time schools did not like their students to write with pen. Perhaps it was 16 _ pens can leak and it is easy to spill the ink. And 17 _ is hard to write on thin or cheap paper with them.,16. 根据前后句的因果关系可知填because引导原因从句。 17. 作形式主语
2、替代后面的不定式。,because,it,Ladislao Biro 18 _(work) for a newspaper in Budapest. He spent all day at his desk. Day in and day out, he corrected pages of thin, cheap paper 19 _ a pen and ink. He often had to stop to fill his pen and it did not write 20 _(good) on the thin paper.,18. 由上下文可知用一般过去时。 19. 介词wit
3、h这里意为“用”。 20. 副词作状语, 修饰write。,worked,with,well,He and his brother George began some experiments. They wanted a pen 21 _ _ did not leak, with ink that did not spill. Why not use a little ball 22 _the end?Two Englishmen, Henry Martin and Frederick Miles, liked 23 _ idea.,21. 引导定语从句修饰前面的pen。 22. 根据搭配,
4、at the end“在末端”。 23. 指代上文提到的想法。,at,the,It was the time of the Second World War. The Air Force needed a non-leak, non-spill pen for the men 24 _(write) with on planes. Martin and Miles made 25 _sold many thousands of Biro “writing-sticks” to the Air Force.,24. 不定式作补语。 25. 前后动词为先后关系, 故填and。,to write,a
5、nd,(32)Suppose you are going to Boston, and you have never visited the city before. If someone tells you about the interesting places in the city, you begin to get some ideas 16 _what you will see. But dont have 17 _clear idea of where these places are or of how to find them.,16. 因idea 后接of说明idea的内容
6、。 17. 不定冠词表示“一个”。,of,a,However, 18 _ someone has a map of the city and shows you the main roads and buildings, you may say, “Oh, now I see. I can find my way with no trouble at all.” 19 _ (work) at math is somewhat like trying to find your way to a new city.,18. 根据前后句的条件关系可知填if引导条件从句。 19. 动名词作主语。,if
7、,Working,Perhaps the words may tell you some 20 _(inform) and you have thought it over, 21 _ you cant see any clear road to the answers. Maybe 22 _need to have a kind of map of the main roads in maths to help you find your way.,20. 名词作宾语。 21. 前后为转折关系, 故填but。 22. 根据句中的to help you可知。,information,but,y
8、ou,Explore what lies 23 _ maths, and try your best to find the main roads. They 24 _ (lead) you to the answer. If you can find the “map”, the maths problems will 25 _(work) out easily.,23. 介词in此处意为“在里面”。 24. 由上下文可知用一般将来时。 25. 由主语可知用被动语态。,in,will lead,be worked,(33)The computer plays an important par
9、t in our everyday life. It is one of the great 16 _(invent) in the world in the twentieth century. It works for us not only at home, in offices, in big shops, but also at schools. Today it is used 17 _many ways. It really brings the world large wealth 18 _ happiness.,16. 名词作表语, 根据句中的one of可知用复数。 17.
10、 根据后面的ways可知填in。 18. 前后为并列关系, 故填and。,inventions,in,and,19 _first computer in the world 20 _ (call) Enid. It was built in America in 1946. It was large and heavy. Since it was born, it 21 _(develop) very fast. Until now it has gone through four periods and changed a lot.,19. 定冠词的基本用法, 序数词前用the表顺序。 20
11、. 由主语可知用被动。 21. 根据前面的since短语可知。,The,was called,has been developing,Therere many kinds of computers. Computers are getting smaller and smaller and computing faster and faster. So 22 _are becoming more and more helpful.The computer can do most of the things for people.,22. 指代前面的computers。,they,It can
12、help us 23 _(know) about the real world more quickly, to learn 24 _ we want to learn and to think for ourselves. 25 _a student in the twenty-first century, you must work hard at it.,23. 不定式作us的补语, 后面并列的不定式有to,所以这里也不省略to。,to know,what,As,24. 引导宾语从句, 作从句的宾语。 25. 介词as此处意为“作为”。,(34)The computer is fast,
13、 and never makes a mistake, while people are too slow, and full of mistakes sometimes. Thats 16 _ people often say when they talk about computers. For over a quarter of a century, scientists 17 _ (make) better and better computers.,16. 引导表语从句, 作从句的宾语。 17. 根据句首的时间状语可知用完成进行时态。,what,have been making,No
14、w a computer can do a lot of everyday jobs wonderfully. 18 _is widely used in factories, hospitals, post offices and airports. A computer can report, decide and control in almost every field. Many computer scientists are thinking of making the computer “think” like a man. 19 _ the help of a person,
15、a computer can draw pictures, write music, talk with people, play chess, recognize voices, translate languages and so on.,18. 指代前面的a computer。 19. 固定搭配, with the help of“在的帮助下”。,With,It,Perhaps computers will one day 20 _ (real) think and feel. Do you think the people will be afraid 21 _ they find t
16、hat the computer is too clever 22 _ (listen) to and serve the people?,20. 副词作状语修饰动词think 和 feel。 21. 根据前后句的时间关系可知填when引导时间从句。,really,when,to listen,22. 固定搭配, too.to do“太而不能”。,No, people will make 23 _ (good) use of the computers in the future. Man is always 24 _master of the computer. The computer w
17、orks only with the help of man. It cannot take the place 25 _ man.,23. 隐含比较级, 根据句末的in the future推出。 24. 有表示限制的介词短语of the computer修饰, 表示特指。,better,the,of,25. 固定搭配, take the place of“代替”。,(35)Life in the 21st century will be very different. Many changes will take place, but what will the changes be? T
18、he population 16 _ (grow) fast. There will be many people in the world and most of them will live longer 17 _ people in the 20th century.,16. 根据句意要用现在进行时。 17. 根据空前的longer可推出填than。,is growing,than,Computers will be much smaller and more useful and there will be at least one 18 _ every home. And compu
19、ter studies will be 19 _ of the important subjects in school then.People will work 20 _(few) hours and they will have more free time for sports, watching TV and traveling.,18. 因home前有限定词时前面要用in。 19. 根据句意及空后内容可知。 20. 根据more free time可推出。,fewer,one,in,Traveling will be much easier and cheaper, 21 _man
20、y more people will go to other countries 22 _holidays.There will be changes in our food, too. Maybe no one will eat meat every day. Instead, they eat more fruit and vegetables.,21. 前后是完整的单句, 且为并列关系, 故填and。 22. 介词for表目的。,and,for,Maybe people will be healthier. Work in the future will be 23 _(differ),
21、 too. Dangerous and hard work can be done by robots. Because of this, many people will not have enough work 24 _(do). This will be 25 _ problem.,23. 形容词作表语。 24. 不定式作定语。 25. 不定冠词表示“一个”。,different,to do,a,(36)Overhead bridges can be seen in many parts of Singapore, in places where traffic is very heav
22、y and crossing the road is not safe.These bridges can make people cross roads safely. Overhead bridges 16 _ (use) in much the same way 17 _zebra crossings.,16. 由主语可知用被动语态。 17. 根据前面的the same可以推出填as。,are used,as,They are more efficient, 18 _less convenient because people have to climb up a lot of step
23、s. This is 19 _ (convenience) to the old. When people use an overhead bridge, they do not hold up traffic. But when they cross 20 _busy road using a zebra crossing, traffic is held up.,18. 前后为转折关系, 故填though。 19. 形容词作表语。根据句意用反义词。 20. 不定冠词表示“一条”。,inconvenient,a,though,This is why the government 21_ _(
24、build) many overhead bridges to help people and keep traffic moving 22 _ the same time.,21. 由上下文可知用现在完成时。 22. 固定搭配, at the same time“同时”。,at,Old people may find it a little difficult climbing up and down the steps, but 23 _ is still much safer than 24 _ (walk) across the road with all the moving tra
25、ffic.People, both old and young, should always use overhead bridges, 25 _will stop accidents from happening.,23. 指代前面的climbing up and down the steps。 24. 动名词作主语。 25. 引导定语从句修饰前面的主句。,it,walking,which,(37)You may think there is only sand in the desert of the world, but it is not true. In the desert, 16
26、 _ we know, there is a little rainbut it is not enough 17 _ most plants. Still we can see some plants live in the desert.,16. 引导从句前置的定语从句。as“正如”。 17. 介词for此处意为“对于”。,as,for,There is water in some places in the desert. We 18 _(call) these places oases(绿洲). In the oases, there are villages and towns. P
27、eople grow all kinds of crops in 19 _ fields there.People also live outside the oases. They have camels, 20 _ (sheep) and other animals.,18. 由上下文可知用一般过去时。 19. 特指那个地方的fields, there 作定语。 20. 根据前后一致原则, 用复数。注意sheep是单复同形的名词。,sheep,the,call,These animals depend 21 _the desert plants for their food and do
28、not need much water.The animals are useful to the desert people in many ways. 22 _eat the meat and drink the milk of the animals. They use the camels for 23 _(carry) water, food, tents and something else.,21. 固定搭配, depend on“依靠; 依赖”。 22. 指代前面的The animals。 23. 根据空前的for可知, 作介词的宾语。,carrying,They,on,The
29、 people of the desert have to keep moving from place to place. They must always look for grass or desert plants for their animals. 24 _there is no more food for their animals, they move to 25 _ place.,24. 根据前后句的时间关系可知填when引导时间从句。 25. 根据前面的from place to place可推出填another。,When,another,(38)The water an
30、d the land are thought part of the earth surface. The air is usually thought a kind of blanket around the earth. But it is more than that. Maybe you have been in 16 _ cave deep. Did you think about the air 17 _ was in the cave? The land has some air 18 _(mix) in it.,16. 不定冠词表示“一个”。 17. 引导定语从句并在从句中作主
31、语, 先行词是物。 18. 因air与mix是被动关系, 用过去分词作定语。,mixed,that /which,a,Air is even mixed 19 _the water in the sea. Some air is below the earths surface as well as above 20 _.Men once thought that there were four basic things from which everything else 21 _(make).,19. 因mix后常接with, 表示“与混合”。,20. 指代前面的surface。 21.
32、一般过去时的被动语态。,with,it,was made,They called these things earth, fire, air and water. 22 _man made more observations, they decided that fire was not an element. At last they concluded that land, air and water were not elements, either.In fact, there are more than 100 elements 23 _which scientists believ
33、e all things are made.,22. 引导时间状语从句, 表示“随着”。 23. 根据从句中的made可知。,As,from,Though land, air and water are not elements, they are three main parts of 24 _(man) environment. You 25 _(know) more about them as you study the earth.,24. 名词所有格作定语。 25. 由上下文可知用一般将来时。,mans,will know,(39)Crocodiles lay their eggs
34、and leave them under leaves or sand. Baby crocodiles use their 16 _(tooth) to break their way out of the shells.Crocodiles only live where it is hot. They 17 _ (find) in Australia and America. They spend most of their time 18 _(lie) around in the rivers.,16. 名词作宾语。tooth的复数是teeth。 17. 由主语可知用被动语态。 18.
35、 由spend time (in)doing可知。,teeth,are found,lying,The crocodiles long tail is used when the animal is swimming. It is 19 _excellent weapon. It can be used to strike the enemy. One blow will knock down a man 20 _ even a big animal at once. The crocodile has a hard neck.,19. 不定冠词表类别。 20. 前后句之间为选择关系, 故填o
36、r。,an,or,It cannot turn its head from side to side， 21 _ it can only see things in front of itself. The crocodile 22 _(have) its teeth cleaned by the crocodile bird. For its food this bird takes the bits 23 _the crocodiles mouth.,21. 根据前后句之间的因果关系可知填so。 22. 由上下文可知用一般现在时。 23. 介词in表示“在里面”。,so,has,in,Th
37、is helps the crocodile a lot because 24 _ cannot move its tongue up and down. 25 _ its terrible teeth it catches its food. The food may be a fish, an animal, or even a careless man.,24. 指代the crocodile。 25. 介词with此处意为“用”。,it,With,(40)Farley worked for the Canadian government. One day, he 16 _(tell)
38、to learn more about wolves, so he was taken to a faraway place by plane. The plane put him down and 17 _(fly) away. There were no houses or people here. But there were lots of animals, including wolves.,16. 根据句意及后文的was taken可知要用过去时的被动语态。 17. 根据前后内容可知用一般过去时, 注意：fly (flew, flown)。,was told,flew,People
39、 tell terrible stories about wolves. They say wolves like 18 _ (kill) and eat people. Farley remembered these stories, 19 _he was afraid. Therefore, he had his gun with him all the time. Then one day, he saw a group of wolves. There was a mother wolf with four baby wolves.,18. 不定式作like的宾语, 由与之并列的eat
40、可知填to kill。 19. 前后是完整的单句, 且为顺承关系, 故填and。,to kill,and,A father wolf and another young wolf lived with 20 _.Farley watched these wolves every day. The mother was a very good mother. She gave milk to her 21 _(baby). She gave them lessons about life. They learned 22 _to get food.,20. 指代前面的a mother wolf
41、with four baby wolves, 因此填them。 21. 上段有four baby wolves, 这里自然要用复数。 22. 根据句意及后面的不定式可知填how。,how,babies,them,The father wolf hunted food for the mother. The young wolf played 23 _ the children. They were a nice, happy family wolf family! In 24 _ short time, he got on well with the family. Farley watched them 25 _ five months. He learned that many stories about wolves were not true.,23. 根据句意应填with, 这里意为“与一起”。 24. 短语搭配, in a short time“没多久”。 25. 一段时间前一般用介词for。,for,a,with,Thank you !,
