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
As I regard it, you can widen the ______ of these improvements through your active participation.
A．volume
B．dimension
C．magnitude
D．scope
单项选择题
______ there is little we can do to modify the weather, we can at least know what kind of weather to expect.
A．Since
B．When
C．While
D．Unless
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