Why does the author say summer is a good time to take a long vacation from thinking?

A) Because a long vacation in summer helps to improve people’s mental power.

B) Because people tend to be less creative during summer.

C) Because summer is a good time for outdoor activities.

D) Because mental exertion in the summer heat taxes too much of people’s energy.
出自:河南城建学院-大学英语2

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