题目

学校的课外生物小组的实验园地是一块长35米，宽26米的长方形，为了便于行走和管理，现要在中间修同样宽的到路，路宽均为a米，余下的作为种植面积，求种植面积是多少？   答案：              解：设道路的宽应为a米，由题意得： （35﹣a）（26﹣a）=a2﹣61a+910， 答：种植面积是a2﹣61a+910．How tired you look! You _____ these weeks. I think you need a holiday before you burn out. A. had overworkedB. overworked C. have been overworking D. were overworked