题目内容
【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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