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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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
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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