![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
(2) You may wonder__1__we have a holiday in summer and 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 at any__5__time of the year. Ellsworth Huntington, __6__is well known to us all, __7__(conclude) from other men's work and his own among people in different climates that climate and temperature have a clear effect__8__our intelligence. He found that cool weather is far better for creative thinking than warm weather. This does mean that all people are not as quick at __9__(learn) in the summer as they are during the rest of the year. It tells us, however,__10__intelligence of large numbers of people seems to be lowest in the summer.