单项选择题

Investment in new product development is an essential ______ of corporate success.

A．component
B．ingredient
C．constituent
D．element
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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
单项选择题
There are several theories as to why the dinosaurs become ______.
A．extinct
B．credible
C．distinct
D．esthetic
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