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.
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单项选择题
A．They have a big fight.B．They have a quarreling.C．They are breaking up.D．They will get married.
A．They have a big fight.
B．They have a quarreling.
C．They are breaking up.
D．They will get married.
单项选择题
A．Because she wants to study for a test.B．Because she wants to go swimming at the student center.C．Because she has to do research in the library.D．Because she is not interested in the man.
A．Because she wants to study for a test.
B．Because she wants to go swimming at the student center.
C．Because she has to do research in the library.
D．Because she is not interested in the man.
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