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9.Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.(  )
A.whenB.beforeC.whileD.since

分析 一些人通过手机互相联系,而其他人通过邮件来相互保持联系.

解答 答案:C.根据Some people get in touch with each other by mobile phones(一些人通过手机互相联系)和others keep contact with each other by e-mail(其他人通过邮件来相互保持联系)的含义可知,两句之间是对比关系,所以答案是C while"然而".

点评 考查从属连词.
while 用作连词时,有以下几种含义:
1.意为"当…时候,和…同时",引导时间状语从句.例如:
While I was watching TV,the bell rang.(我看电视时,铃响了.)
2.意为"虽然,尽管",引导让步状语从句.例如:
While it was late,he went on working.(虽然很晚了,但他还在继续工作.)
3.连接两个并列句子,表示"对比"关系.例如:
He went out for a walk,while I stayed at home.(他出去散步了,而我却呆在家里.)

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