单项选择题

All young men are required to do two years of______ military service.

A．obliged
B．indispensable
C．compulsory
D．compelling
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单项选择题
There's a______ in the fact that although we're living longer than ever before, people are more puzzled by health issues than they ever were.
A．analogy
B．paradox
C．dilemma
D．illusion
单项选择题
Even a very young animal has a strong______ for self-preservation.
A．consciousness
B．impulse
C．instinct
D．response
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