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(),mobile phones are being more and more widely used.It′s small in size,(),offering fast and convenient service for communication.It′s of multi-function.().
In recent years,(),Quite a few use them at school to keep in touch with their families and friends instead of writing letters,which,of course brings convenience to them.But I don′t think it′s good to do so.
(),student users often waste a lot of time chatting over the phone in their spare time,some even use them to cheat in exams.In addition,mobile phone bill is also a heavy burden on students′families.

【参考答案】

A;C;B;D;E
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