The first paragraph mainly tells us______. Which of the following pictures best tells the movements of warm air and cold air?

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问题 The first paragraph mainly tells us______.
Which of the following pictures best tells the movements of warm air and cold air?

选项 A、

B、

C、

D、

答案B

解析根据第二段的第三句可知：热空气上升，冷空气取而代之，故选B。

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