题目

根据对话内容，从下面方框中选择适当的单词或短语填空，使对话内容完整正确 thousandsof       hopeless    turning off      so      What    A:  Hey! I met a student from a green school in Dalian. B:  A green school?      1    is it? A:  It is a school which supports the protection of the environment. In fact,    there are   2   green schools in China. It’s wasteful to throw away glass,   paper and metal,   3    every class in such schools collects waste that can be used again and then sells it for recycling学校要在三至五年级挑选合唱队队员．如果五年级选了30名，四年级和三年级依次少选5名，那么合唱队一共有多少人？