单项选择题

A．Three weeks.
B．Five weeks.
C．Three months.
D．Five months.
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单项选择题
A．Sending e-mails.B．Learning things.C．Chatting in chat rooms.D．Collecting information.
A．Sending e-mails.
B．Learning things.
C．Chatting in chat rooms.
D．Collecting information.
填空题
teenagers
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