题目

阅读表达  阅读下面的短文，根据短文内容回答问题。 In the past, people used words to express their ideas and feelings. Now people have a new way to share their life with their friends on WeChat Moments (微信朋友圈). To make WeChat Moments, people can use pictures, sounds, videos and their words to express what they want to say. Some people don’t write anything. They share what they are eating, drinking, listening to, buying and fun time by sharing pictures. Someone says that WeChat Moments are like personal TV stations. People don’t have to spend money put把函数y=sin（2x-π5）的图象上的所有点向右平移π5个单位，再把所有点的横坐标缩短到原来的一半，而把所有点的纵坐标伸长到原来的4倍，所得图象的表达式是 （　　） A、y=4sin4xB、y=4sin（4x-2π5）C、y=4sin（4x+π5）D、y=4sin（4x-3π5）