单项选择题

After 10 hours at the wheel of the car, he began to feel the ______.

A．tension
B．nervous
C．exertion
D．strain
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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
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
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