单项选择题

A．Because they are not accustomed to it.
B．Because they are not psychologically prepared for it.
C．Because their genes differ from those who have been tested for it.
D．Because they are less sensitive to it than those who have been tested for it.
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单项选择题
A．Classmates.B．Colleagues.C．Boss and secretary.D．PR representative and client.
A．Classmates.
B．Colleagues.
C．Boss and secretary.
D．PR representative and client.
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.
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