题目

如图，在直角梯形ABCD中，AB=2，BC=4，AD=6，M是CD的中点，点P在直角梯形的边上沿A→B→C→M运动，则△APM的面积y与点P经过的路程x之间的函数关系用图象表示是（ ） A . B . C . D . 答案：D. He always_________his time and his efforts       .        A．made the most of; paid off                          B．made good use of; paid back        C．took the most of; paid for                                   D．made most of; paid up