题目

— I hate school; it’s not for me. I think I’ll quit.    — You         stupid! It takes effort now, but later you will benefit from it. A. will be           B. are being         C. have been         D. were being   答案：B如图，一段河坝的横断面是梯形ABCD，试根据图中数据，求出坡角a和坝底宽AD．