单项选择题

A．Classmates.
B．Colleagues.
C．Boss and secretary.
D．PR representative and client.
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单项选择题
A．If they don’t involve any risks.B．If they produce predictable side effects.C．When the urgent need for them arises.D．When tests show that they are relatively safe.
A．If they don’t involve any risks.
B．If they produce predictable side effects.
C．When the urgent need for them arises.
D．When tests show that they are relatively safe.
单项选择题
A．The long wait.B．The broken-down computer.C．The mistakes in her telephone bill.D．The bad telephone service.
A．The long wait.
B．The broken-down computer.
C．The mistakes in her telephone bill.
D．The bad telephone service.
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