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    The greenhouse effect comes into being because of too much _______ in space.

    A. ozone
    B. carbon dioxide
    C. carbon oxide
    D. oxygen
    B
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    科目：初中英语 来源：模拟题 题型：单选题

    The greenhouse effect comes into being because of too much _______ in space.
    [     ]
    A. ozone
    B. carbon dioxide
    C. carbon oxide
    D. oxygen

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