单项选择题

He seems to be ______ enough to climb to the mountain top in an hour.

A．radiant
B．conspicuous
C．conscientious
D．energetic
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单项选择题
Most scientists believe it is ______ to use animals in medical research.
A．legitimate
B．explicit
C．edible
D．illiterate
单项选择题
Are you still ______ that the climbers can be rescued
A．enthusiastic
B．optimistic
C．pessimistic
D．domestic
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