A-A+
Why is it warmer on the side of a hill than on
问题详情
Why is it warmer on the side of a hill than on the valley floor？
A．Because warmer air lifts up and off the valley floor, especially on clear nights.
B．Because there is difference between the temperature.
C．Because cold wind blows down to the valley.
D．No information is mentioned in the passage.
参考答案
正确答案：A
解析：本题的答案不难在文章中找到依据。文章最后一段中有这么一句话：Camp on the side of a hill instead of on the valley floor，especially on clear nights．Warmer air lifts up and off the valley floor on clear nights。B项中只说有温差，但为何存在温差并未说明，还是未能回答本题所提出的问题。C项在文中根本未提及，而D项更是与文章内容不相符，因此A项“因为暖气流上升离开谷底，尤其是在晴朗的夜晚。”为本题正确答案。
