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    The scientists all over the world are trying their best to develop _____ energy, such as sunlight, wind and
    water for power and fuel.

    A. unique
    B. alternative
    C. primary
    D. instant
    B
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    科目：高中英语 来源：河南省期中题 题型：单选题

    The scientists all over the world are trying their best to develop _____ energy, such as sunlight, wind and
    water for power and fuel.
    [     ]
    A. unique
    B. alternative
    C. primary
    D. instant

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