单项选择题

These are students who, at some stage of their undergraduate careers have class, either ______, or because they are asked to do so.

A．voluntarily
B．selectively
C．compulsorily
D．necessarily
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单项选择题
Citizens of developed and developing nations alike face dangers from （） medicines; they pose a terrible hazard to public health.

A．distinctive
B．proliferating
C．fraudulent
D．getting along
单项选择题
New Zealanders colloquially refer to themselves as Kiwis , ______ the country s native bird.
A．for
B．by
C．with
D．after
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