Question

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).

1.In the first paragraph， the underlined word “it” refers to     .

A. The hot air over the water

B. The cool air over the earth

C. The hot air over the earth

D. The cool air over the water

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 saltier.

3.A rock crack when          .   .

A. rain falls         B. it gets very hot

C. it gets very cold    D. Both B and C

4.Which of the following is NOT mentioned in this passage?

A. The reason why people feel cool when they are near a lake or an ocean in hot weather.

B. The reason why the ocean doesn’t get saltier every year.

C. The reason why the water in the ocean is salty.

D. The reason why rocks crack.

5.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.

Answer

1.B

2.A

3.D

4.B

5.B

【解析】

试题分析：这篇文章讲述了科学家能够回答一些问题，但并不能回答所有问题。我们知道为什么夏天的海边和湖边会感觉凉快，知道海里的盐来自哪里，但是科学家们也不确定海里的盐会怎么样。还有很多的问题等着我们去解决。

1.B考查细节理解题。When you are near a lake or an ocean， you feel the cool air when it moves in.根据上文可知，太阳使陆地升热，却不能使水变热。地面的热空气上升后，水上的冷空气进来，然后取代了热空气的位置，这时候你在湖或海的附近时，你感到冷空气在流动。故it指代陆上的冷空气。故选B。

2.A考查细节理解题。A. What makes people feel cool near a lake or an ocean in summer. 夏天在湖泊或海洋附近时，什么让人们感到凉爽。B. Everything about the ocean. 海洋的一切。C. What happens to the salt in the ocean. 海洋的盐会发生什么事。D. Why the ocean does not get more saltier. 为什么海洋不会变得更咸。根据第一段可知A正确。

3.D考查细节理解题。根据第二段第三句When a rock gets very hot or very cool， it cracks (崩裂) ，可知选D。

4.B考查细节理解题。根据第一段第一句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?与第二段第二句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.可知A，D和C在短文中被提及。故选B。

5.考查主旨理解题。A. people feel cool when they are near a lake or an ocean. 在一个湖泊或海洋附近时，人们感到凉爽。B. scientists can explain many things， but not everything. 科学家可以解释很多东西，但不是所有的东西。C. scientists can explain everything about the ocean.科学家可以解释海洋一切东西。

D. the salt in the ocean comes from rocks.

考点：考查科普类阅读。