小题1:C
小题2:A
小题3:B
小题4:A
小题5:D
小题1:根据文章内容The students were having their chemistry class可知答案为C
小题2:根据文章内容Miss Li was telling the children what water was like.可知答案为A
小题3:根据文章内容
可知答案为B
小题4:根据文章内容
可知答案为A
小题5:根据文章内容“I’m sorry，children.” said the teacher，“Our water is getting dirtier and dirtier．That’s a problem.”可知答案为D