题目

在下列实例中，通过食物链而引起的危害是A．大气中的臭氧层出现空洞B．温室效应C．汞、DDT等有毒物质的积累D．酸雨 答案：C解析:略Maria enjoys _____ music. And she can sing a lot of songs.A. listening B. to listen to C. listening to