题目

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。 Elephants are able to know the difference between a man and a woman, and can tell an adult (成年人) from a child—all from the sound of a human voice. This is according to a study in which researchers played voice recordings to wild African elephants. The animals showed more fear when they heard the voices of adult Masai men. Usually Masai people hunt elephants, and this suggests that animals have grown to listen for and avoid them. Prof. Karen McComb and Dr Graeme Shannon from the University 将点A（p， q） （p＞0，q＞0）向下平移p个单位，再向左平移q个单位得到点B，则点B的坐标为（       ） A. （0， 0）    B. （2p， 0）    C. （0，2q）     D. （p－q， q－p）