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21.C推理判断题。电子邮件是学校目前最流行的的交流方式,也就是通过网络联系,由第三段Get the teacher's e-mail address. This is how most of the schools communicate in today's society".22.B细节理解题如果公共汽车站没有其他的孩子在等车,家长必须陪着孩子等车,不能把孩子一个人留在车站,由第四段“Never leave your child at the bus stop alone可知23.A细节理解题根据文章最后一段Don''t wait until your child is failing behind others.”可知24.B推理判断题。妹妹出生时没有呼吸,大家都在抢救她,注意力都在她身上,由第一段 From the moment Caroline was born, she took all the attention for herself. When my mother and grandmother told the story of our births, it was mostly of how Caroline had refused to breathe .