The first paragraph mainly tells us . Air moves under such conditions that .

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问题 The first paragraph mainly tells us ______.
Air moves under such conditions that ______.

选项 A、there is air pressure
B、the air is heavy
C、air pressure doesn’t remain the same all the time
D、air comes up and down

答案C

解析空气的流动在于气压的变化，故选C。

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The first paragraph mainly tells us . Air moves under such conditions that .

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