When the weather is hot, you go to a lake or an ocean. When you are nears lake or an ocean, you feel cool. Why? The sun makes the ear& hot, but it cannot make the water very hot. Although the air over the earth becomes hot, the air over the water keeps cool. The hot air over the earth goes up. Then the cool air over the water moves in and takes the place of the hot air. When you are near a lake or an ocean, you feel the cool air. When it moves in, you feel the wind. And the wind makes you cool. Of course, scientists cannot answer all of our questions, ff you ask, "Why is the ocean full of salt?", scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks (裂开). Rain falls into the cracks .The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, "What happens to the salt in the ocean?" The ocean does not get more salty every year. Scientists are not sure about the answer to the question. We know a lot　about our world. But there are still many answers that we don't have, and we are curious(好奇的).

1. Now scientists know_______

A. what makes people feel cool near a lake or an ocean in summer

B. everything about the ocean

C. why the ocean doesn't get more salty

D. what happens to the salt in the ocean

2. In this passage the word "cracks" means _______in Chinese.

A. 山谷       B.裂缝       C. 地壳     D. 岩浆

3. Which of the following is not true?

  A. The sun makes the earth hot.

  B. The sun cannot make the water very hot.

  C. The wind makes you tout.

  D. The hot air over the water moves in and takes the place of the cold air

4. People are always curious about the world because______

A. they know nothing about it      

B. they know little about it

C. there are many answers they do not have     

D. both. A and B

5. The main idea of this passage is that ______

A. the salt in the ocean comes from rocks

B. scientists can explain (解释) everything we want to know

C. people feel cool when they are near a lake or an ocean

D. scientists can explain many things, but not everything

Antarctica is the highest continent on Earth，with the coldest temperatures and the most wind．People have never wanted to live there because it is so cold．The lowest temperature once was -89.2℃! But now scientists from all over the world come to study the ice．They want to learn more about the Earth's history．

     Some scientists live on Antarctica for part of the year．But they don't usually stay there for more than six months．Why? There are six months of light and six months of darkness．

      Antarctica usually has a good deal of fine weather without any wind at all．The strong winds are usually only in some parts of it.  It is also interesting to learn that it isn't very wet there．There is very little snow or rain．It snows on the ice in winter，but at other times Antarctica is dry，just like the Sahara Desert（撒哈拉沙漠）．

      In winter the sea around Antarctica freezes for thousands of kilometres．But scientists tell us that the Earth is getting warmer．So in future，there may be less ice in the Antarctic sea．When that happens, our weather will never be the same again．

根据短文内容判断正误。正确的在括号中写“T”，错误的写“F”。

1．A lot of people want to live in Antarctica．（    ）

2．It's possible to learn about the Earth's history by studying the ice．（    ）

3．It is windy everywhere in Antarctica．（    ）

4．In winter the sea around Antarctica becomes ice．（    ）

5．Our weather might be different in future．（    ）

完形填空

　　The weather in our town today is different from that many years ago. It was too hot at the time. Now it becomes 1 because all the mountains around our town 2 trees. There is no more sand on the surface of the earth 3 these new trees. At the beginning of this century, sand was 4 here. 5 we couldn't 6 any plants in this poor land. In 1952, a number of young people came to live here. They wanted 7 this poor land with their hands. They worked hard to plant trees to stop earth 8 sending away. After many years of hard work, a beautiful new town 9 on the poor land. Now, people on this town still go on planting more trees all the time. They want to keep it much more beautiful later 10 ．

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阅读理解

　　When the weather is hot, you go to a lake or an ocean. When you are near a lake or an ocean, you feel cold. Why? The sun makes the earth hot but it can not make the water very hot. Although the air over the earth becomes hot, the air over the water stays cool. The hot air over the earth goes up. Then the cool air over the water moves in and takes the place of the hot air. When it moves in, you feel the wind. And the wind makes you cool.

　　Of course, scientists can not answer all of our questions. If we ask, “Why is the ocean full of salt?” Scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks(断裂). Rain falls into the cracks. The rain then carries salt into the ocean. But then we ask, “What happens to the salt in the ocean?” The ocean does not get more salty every year. Scientists are not sure about the answer to this question.

　　We know a lot about our world. But there are still many answers that we do not have, and we are curious.

1．The main idea of this passage is that ________.

[　　]

A．people feel cool when they are near a lake or an ocean

B．scientists, can explain many things, but not everything

C．scientists can explain everything about the ocean

D．the salt in the ocean comes from rocks

2．Now scientists know ________.

[　　]

A．what makes people feel cool near a lake or an ocean in summer

B．everything about the ocean

C．what happens to the salt in the ocean

D．why the ocean does not get more and more salty

3．A rock cracks when ________.

[　　]

4．People are always curious because ________.

[　　]

A．they know nothing about the world

B．they know not a little knowledge about the world

C．there are many answers they don't agree

D．there are many things they don't know

5．Which of the following reasons is NOT mentioned(提到) in this passage?

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A．Why do people feel cool when they are near a lake or an ocean in hot weather.

B．Why doesn't the ocean get more salty every year?

C．Why is the ocean water salty?

D．Why do rocks crack?