英语六级

单选题

A．It's the ultimate cause of winds.
B．It causes vertical movements of air.
C．It reduces differences in air pressure.
D．It's used to predict weather patterns.

参考答案：A进入在线模考
Why does the speaker mention solar radiation?
细节题。根据The term wind applies only to horizontal movements．And more air is involved in horizontal movements …And what causes the horizontal movements? Alternately，it's the solar radiation可知，风就是水平运动的空气，而是什么引起水平运动呢?是太阳辐射。所以太阳是风的最终成因。因此，正确答案为A。

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A．Repeat it aloud.
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