Mr. Huntington's study showed that ______.
A、the climate of the place where one lives may have an effect on his intelligence
B、all people turn out to be less intelligent in summer due to the hith temperature
C、people are less smart in summer due to the lack of factors existing in spring
D、people live in tropic are less intelligent than people live in cooler area
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试题解析
47.答案为C。根据第三段第一句,Spring appears to be the best period of the year for thinking作出该项选择。