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
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单项选择题
Measures of the American Government to combat terrorism will be high on the ______.
A．agenda
B．schedule
C．routine
D．timetable
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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