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
There are many who believe that the use of force ______ political ends can never be justified.
A．in search of
B．in pursuit of
C．in view of
D．in light of
单项选择题
The ______ of the flood, which caused thousands of people to lose their houses, was 3 weeks of torrential min.
A．source
B．origin
C．root
D．resource
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