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．was
C．would
D．did
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单项选择题
The current rate of annual increase in the world population is about_________.
A．9 million.
B．5.7 million.
C．90 million.
D．20 million.
单项选择题
________killed the three chickens.
A．The cruel master
B．The man in the kitchen
C．The pet bird
D．The fourth chicken
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