单项选择题

A．If one gets anxious or depressed when not online.
B．If a student is isolated by his peers.
C．If one finds it hard to concentrate in his work.
D．If one has an urge to surf the Net whenever he can.
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单项选择题
A．They have been cooperating for a couple of years.B．They are about to sign the first contract between them.C．They have been long-term business partners.D．They are starting to get acquainted with each other.
A．They have been cooperating for a couple of years.
B．They are about to sign the first contract between them.
C．They have been long-term business partners.
D．They are starting to get acquainted with each other.
单项选择题
A．It was burned down.B．It was robbed.C．It was blown up.D．It was closed down.
A．It was burned down.
B．It was robbed.
C．It was blown up.
D．It was closed down.
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