题目

夏天，人们常在摩托车黑色的坐垫上套上铝箔做的坐垫套，主要目的是(    )。   A . 吸收更多的热量 B . 减少吸收的热量 C . 美观 答案：B—Why is the classroom so dirty? —Sorry, sir. It             yesterday. We forgot to do it. [     ]A. don't clean B. didn't clean C. weren't cleaned D. wasn't cleaned