单选题 If you are like most people, your intelligence varies from season to season. You are probably a lot sharper in the spring than you are at any other time of year. A noted scientist, Ells- worth Huntington (1876-1947) concluded from other men's work and his own among peoples in different climates that climate and: temperature have a definite effect on our mental abilities.
He found that cool weather is much more favorable for creative thinking than summer heat is. This does not mean that all people are less intelligent in the summer than they are during the rest of the year. It does mean, however, that mental, abilities of large numbers of people tend to be lowest in the summer.
Spring appears to be the best period of the year for thinking. One reason may be that in the spring man's mental abilities are affected by the same factors that bring about great changes in all nature.
Fall is the next best season, then winter. As for summer, it seems to be a good time to take a long vacation from thinking!

单选题 According to the passage, your mental ability ______.
【正确答案】 B
【答案解析】根据第一段最后一句Ellsworth Huntington (1876-1947) concluded from other men's work and his own among peoples in different climates...作出该项选择。
单选题 Mr. Huntington's study showed that ______.
【正确答案】 C
【答案解析】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。
单选题 Which of the following statements is NOT mentioned in the passage?
【正确答案】 B
【答案解析】根据第一段最后一句，that climate and temperature have a definite effect on our mental abilities作出该项选择。
单选题 The concept discussed in the passage is actually the ______.
【正确答案】 C
【答案解析】根据最后一段最后一句，As for summer，it seems to be a good time to take a long vacation from thinking作出该项选择。
单选题 It is not stated but implied in the passage that ______.
【正确答案】 A
【答案解析】根据第二段第一句，He found that cool weather is much more favorable for creative thinking than summer heat is作出该项选择。