跟蹤導(dǎo)練（一）6

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A

One large dinosaur hid in the thick jungle （熱帶雨林）. With small， hungry eyes he watched a larger dinosaur， about 90 feet long！ It was eating grass by a lake.

The one in the jungle stood 20 feet tall on his powerful back legs. His two front legs were short， with sharp claws on the feet. His teeth were like long knives.

There was only one hope for the grass-eating dinosaur. Even though he was three times as large as his enemy， he was not a fighter. He could only try to get away， into deep water， where he could be safe.

The grass-eater tried to move fast. But the enemy was faster. His three-toed footprints show that he came closer and closer.

We cant be sure how the fight ended. We can only tell by the animals footprints that the fight did take place. The mud where the two dinosaurs walked has turned into stone.

Footprints are not all that tell us about dinosaurs. Their bones and teeth have also been found. We even have some of their eggs in museums.

Scientists know how to fit a dinosaurs bones together. Then they can tell how the animal may have looked. From its teeth they know whether it ate meat or grass.

Dinosaurs were of many sizes and shapes. Some were as small as chickens. But all of them had very small brains.

Millions of years ago， the dinosaurs ruled the earth. Since then， there have been no dinosaurs. What happened to them？

We know they did not all die at once. It may have taken a few million years for all of them to die.

In the days of the dinosaurs， the whole earth was warm and wet. There were many green jungles. But the earth changes slowly. When parts of the earth became cold and dry， the jungles were becoming less and less. Then dinosaurs could not find enough to eat. This must be one reason why the dinosaurs died out.

1. According to the passage， the grass-eating dinosaurs ___ .

A. had three-toed feet

B. were much smaller than the meat-eaters

C. were three times as large as the meat-eaters

D. had two short front legs， with sharp claws on the feet

2. Which of the following is TRUE about dinosaurs？

A. They had very big brains.

B. All of them were meat-eaters.

C. Most of them were the same size.

D. Some of them tore their enemy with long knife-like teeth.

3. The appearance of dinosaurs would be repaired if ___ .

A. scientists have found their teeth

B. a full-size picture was kept in our mind

C. their bones were well fitted together by scientific method

D. their footprints were entirely taken from the stone for research

4. The dinosaurs all died out may be because of ___ .

A. the reduction of jungles

B. the fights among the dinosaurs

C. the occurence of some diseases

D. the appearance of the global warming

B

One way of preventing floods may be by making rain. This may sound rather strange. As we know， heavy rain is the cause of floods， and in Malaysia most of the floods are caused by the annual monsoon （季風(fēng)）， which brings heavy rain to the east coast. If， however， the rain could be made to fall in the China Sea， there would be no more folds since the rain clouds would not reach the east coast.

Is it possible to make clouds give up their rain？ Yes， it is， the National Institute of Scientific and Industrial Research （NISIR） suggested that it would be tried. The institute knew of course that it was not possible to make all clouds give up all their rain. It calculated （估計(jì)，計(jì)算）， however， that if the frequency of rainfall could be reduced by 10%， and the amount of rain that fell each time could be reduced by 15%， the total amount of flood damage would be reduced by 40%—50%.

As you probably know， clouds are caused by air containing water-vapor （水蒸氣）. The air rises and， since water-vapor becomes water when it cools， very tiny drops of water are formed. Since these drops are very small， they float in the air， and form a cloud. When the cloud rises， however， the drops become colder. Because of this， they join together and become big drops. The big drops are no longer able to float because of their weight， and they fall. As they fall， they pick up more drops and become bigger. This is the cause of rain.

5. According to the passage， one way of preventing flood is ___ .

A. to bring heavy rain

B. to make the rain clouds

C. to cause monsoon in the sea

D. to make the rain fall in the sea before it reaches the coast

6. What does underlined word “it” in the last paragraph refer to？

A. Air. B. Water.

C. Cloud. D. Water-vapor.

7. What does the third paragraph talk about？

A. How rain is formed.

B. How clouds cause rain.

C. How clouds rise the air.

D. How water-vapor floats in the air.

8. What can we learn from the passage？

A. The rain is caused by water-vapor.

B. The clouds rise， and the water drops become smaller.

C. The higher the air rises， the higher the temperature is.

D. The higher the air rises， the lower the temperature gets.

選詞填空

用方框里單詞的正確形式填空，使其句意完整。每空一詞，有兩個詞是多余的。

calm hair frighten sharp nail

claim attack exist creature monster

1. These ____ spend their lives below the ground.

2. He ____ he had not been at the scene of the crime.

3. A lion will ____ people only when it is hungry.

4. The young man made a movement of impatience， but Quilp went on talking ____ .

5. Few animals can ____ in the freezing waters of Arctic.

6. A mountain range shown by this method can look like a（n） ____ caterpillar（毛蟲）.

7. The sound of the river moving about downstream was ____ .

8. The ____ parts of a comb or a saw are called teeth.

句子翻譯

1. 首領(lǐng)死后這些士兵不知該何時(shí)發(fā)起進(jìn)攻。

2. 能夠目擊白鯊被認(rèn)為是很幸運(yùn)的，因?yàn)檫@種動物已經(jīng)非常稀少了。

3. 男孩潛入水中去了解那兒究竟發(fā)生了什么。

4. 我祖父留給我的房子占地約400平方米。