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  3. 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 t

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 t

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问题     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 cannot 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 rises. 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 your 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. Rain falls into the cracks. The rain then carries the salt into the earth and then 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 this question.
    We know a lot about our world. But there are still many answers that we do not have, and we are curious.
Now scientists know ______.
选项 A、what makes people feel cool near a lake or an ocean in summer
B、everything about the ocean
C、why the ocean does not get more and more salty
D、what happens to the salt in the ocean
答案A
解析 本题属推理分析题。文章第一段就是解释人靠近湖边或海边时，为什么感到凉爽。
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