单项选择题

The cause-and-effect relation between AIDS and drugs probably is that _______.

A．AIDS results in drug use
B．drugs helped the spread of AIDS
C．drugs prevented the spread of AIDS
D．drug addiction is the consequence of the spread of AIDS
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单项选择题
Most nurses are women, but in the higher ranks of the medical profession women are in a _______.
A．scarcity
B．minority
C．minimum
D．shortage
单项选择题
Diamonds have little _______ value and their price depends almost entirely on their scarcity.
A．intrinsic
B．eternal
C．subtle
D．inherent
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