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

Believe it or not, the day when you can go to the moon is coming soon. You can go into space   1   space shuttle. It   2   about three days for the shuttle to go from the earth to the moon. The shuttle flies a long way to a space station. You can stay there for a short rest and then it will   3   you to the moon.

       Now you can jump out of the shuttle. But you mustn’t take   4   your spacesuit, because it is very hot in the daytime and very cold at night on the moon. The moon is much smaller than the earth. Things are   5  on the moon than they are on the earth. You can jump high every time you take a step. You will find that it is never tiring to walk on the moon. You don’t need to take an umbrella or a raincoat with you,   6   there is no rain on the moon. You can hear   7   because there is no air on the moon. And there are no animals or   8   living things there.

       The moon moves more slowly than the earth, so one day on the moon is as long as two weeks on the earth and one night is just as long as two weeks on the earth. What could you do in   9   long days and nights and in a silent world? Now scientists are trying to make the   10   of the moon. But our earth is really a far better place to live, as long as we take good care of it.

1.    A. on                           B. in                      C. by                    D. with

2.    A. spends                            B. costs                 C. takes                 D. pays

3.    A. bring                        B. carry                 C. ride                   D. fly

4.    A. up                           B. down                C. on                    D. off

5.    A. light                         B. heavy                C. lighter               D. heavier

6.    A. since                        B. when                C. if                      D. so

7.    A. something                B. anything            C. everything         D. nothing

8.    A. any                          B. other                 C. another             D. /

9.    A. so                            B. such                 C. so a                  D. such a

10.   A. worse                      B. worst                C. better                D. best

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?

[　　]

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?

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 cool. Why？ The sun makes the earth hot, but it can not make the water hot. Though 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 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. 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 cool, it cracks (崩裂) , and rain falls into the cracks. The rain then carries the salt into the earth and 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 saltier 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 do not have, and we are curious(好奇的).

阅读短文，判断正(T)误(F)。

1．Scientists can answer all questions.

(　　)

2．Now scientists know what makes people feel cool near a lake or an ocean. in summer.

(　　)

3．Scientists say that the salt in the ocean comes from rivers and lakes.

(　　)

4．A rock cracks when rain falls.

(　　)

5．People are always curious because there are many new things for them to know.

(　　)