题目内容：
1. According to the passage, man’s intelligence _________.A) stays the same throughout the year
B) varies from day to day
C) changes with the seasons
D) changes from year to year
2. Ellsworth Huntington decided that climate and temperature have _________.
A) a great effect on everyone’s intelligence
B) some effect on most people’s intelligence
C) some effect on a few people’s intelligence
D) no effect on most people’s intelligence
3. Ellsworth Huntington’s conclusion was based on _________.
A) variations of his own mental abilities from season to season
B) the results of research done by him and other scientists among peoples in different climates
C) detailed records of temperature changes in different places
D) detailed records of different ways of thinking among peoples in different climates
4. 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.
5. The central idea of this passage is _________.
A) man’s mental abilities change from season to season
B) man’s intelligence varies
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