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    【题目】The disappearance of dinosaurs is not necessarily caused by astronomical incidents .But _________explanations
    are hard to find .
    A.alternative
    B.aggressive
    C.ambiguous
    D.apparent

    【答案】A
    【解析】句意：恐龙的消失未必是由天文事件引起的，但是难以找到其它解释。A. alternative可供替代的；可选择的；B.aggressive好斗的，有进取心的；C.ambiguous 有野心的，耗时的；D.apparent显而易见的。故选A。

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