基础训练篇（2）You may wonder why we have a holiday in summer (1) winter, but not in spring (2)

基础训练篇（2）
You may wonder why we have a holiday in summer (1) winter, but not in spring (2) autumn. There are some reasons (3) it. Like most people, your intelligence（智力）changes from season to season. You are properly a lot sharper in the spring (4) you are (5) any other time of the year. Ellsworth Huntington, who’s well known to us all concluded from other men’s work and his own among people in different climates that climate and temperature have a clear effect (6) our intelligence. He found that cool weather is far better for creative thinking than warm weather. This (7) mean that all people are not (8) quick at learning in the summer as they (9) during the rest of the year. It tells us, (10) , that intelligence of large numbers of people seems to be lowest in the summer.1. and 2. or 3. for 4. than 5. at

(答案→)1. and 2. or 3. for 4. than 5. at 解析：可联系答.案.网客服索取。

这下我知道了