[单项选择]He found that cool weather is much more favorable for creative thinking than is summer heat. 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 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 of 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.
Most people’s mental abilities seem to be highest
A. in spring.
B. in summer.
C. in fall.
D. in winter.