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
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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
单项选择题
Our civilization cannot be thought of as ______ in a short period of time.
A．to have been created
B．to be created
C．having been created
D．being created
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