【題目】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：恐龍的消失未必是由天文事件引起的，但是難以找到其它解釋。A. alternative可供替代的；可選擇的；B.aggressive好斗的，有進(jìn)取心的；C.ambiguous 有野心的，耗時(shí)的；D.apparent顯而易見的。故選A。

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