单项选择题

The American professor came to realize that he had underestimated the ______ of most of the Chinese students.

A．magnitude
B．gradient
C．potential
D．firmness
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单项选择题
America will never again have as a nation the spirit of adventure as it ______ before the West was settled.
A．could
B．did
C．would
D．was
单项选择题
It took a lot of imagination to come up with such an ______ plan.
A．bright
B．clever
C．brilliant
D．ingenious
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