【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】A考查形容詞辨析。alternative供選擇的,符合句意。aggressive好斗的,有進取心的;ambiguous模糊不清的;apparent顯然的。句意:恐龍的消失并不一定是由天文事件引起的。但是很難找到可供選擇的解釋。

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