单项选择题

The old gentleman was a very _________ looking person, with grey hair and gold spectacles.

A．respectful
B．respected
C．respective
D．respectable
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单项选择题
After several nuclear disasters, a _________ has raged over the safety of nuclear energy.
A．quarrel
B．suspicion
C．verdict
D．controversy
单项选择题
The _________ cycle of life and death is a subject of interest to scientists and philosophers alike.
A．incompatible
B．exceeding
C．instantaneous
D．eternal
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