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
Once our chickens started laying eggs, we had such a ______ of eggs that we were giving many away to our neighbors.
A．output
B．surplus
C．production
D．plenty
单项选择题
If we fail to act now, said Tom, We'll find ourselves ______ in action later on.
A．paid back
B．paid for
C．paid up
D．paid off
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