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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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
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
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