题目内容
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?
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