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 the year. A noted scientist, Ellsworth Huntington concluded from other men’s work and his own among people 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. This does not mean that all people are less intelligent in summer than they are during the rest of the year, It does mean, however, that the 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.

66. According to the passage, the mental abilities of most people ________.

A.      are different from season to season

B.      are the same in all seasons

C.      tend to be lowest in the winter

D.     tend to be lowest in the fall

67. What effect do climate and temperature have according to Ellsworth Huntington’s conclusion?

A. great effect on everyone’s intelligence

B. Some effect on most people’s intelligence

C. Effect on only a few people’s intelligence

D. No effect on people’s intelligence

68. Which of the following is NOT true?

A. Cool weather is good for thinking

B. Winter is the next best season for thinking

C. Summer is a good time to take a long vacation from thinking

D. Nature’s changes may affect our mental abilities

69.What is the possible reason why spring is the best season for thinking?

A. All nature, including man, is growing in spring

B. It lasts longer than the other season

C. It is neither too warm nor too cold

D. Both B and C

70. When should a vacation from thinking be taken according to the passage?

A. During spring and fall.             B. During winter

C. During summer                  D. During summer and winter