单项选择题

Many countries are increasing their, use of natural gas, wind and other forms of______.

A．energy
B．source
C．power
D．material
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单项选择题
【C2】
A．procedure
B．process
C．way
D．method
单项选择题
【C3】
A．adequately
B．attractively
C．urgently
D．eagerly
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