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

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    题型：单项选择题难度：一般
    Many countries are increasing their use of natural gas, wind and other forms of________.
    [????? ] A. energy??
    B. source
    C. power??
    D. force
    答案
    A

高考

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