单项选择题

Another natural ______ that contributes to the welfare of tile country is water.

A．source
B．mineral
C．power
D．resource
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单项选择题
It is not so much your ability ______ your courage that matters in this kind of contest.
A．as
B．but
C．like
D．nor
单项选择题
Trade ______ for a country to exchange its surplus goods for some services abroad.
A．makes possible
B．takes it possible
C．get it possible
D．makes it possible
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