单项选择题

The terms wad and frog refer to two different animals belonging to different genuses, and careful students ______ the two.

A．intermingle
B．ignore
C．distinguish
D．confuse
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单项选择题
The university should ______ the function of the alumni fund so that its importance will be better appreciated by the school's graduates who are asked to contribute to it.
A．revoke
B．elucidate
C．ascertain
D．prescribe
单项选择题
Although a solemn tone was appropriate to the seriousness of the occasion, the speaker lapsed into ______ which was depressing rather than moving.
A．reverence
B．frankness
C．levity
D．morbidity
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