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£¨ÖÇÁ¦£©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.