Question

【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

Answer 1

【答案】A

【解析】A考查形容词辨析。alternative供选择的，符合句意。aggressive好斗的，有进取心的；ambiguous模糊不清的；apparent显然的。句意：恐龙的消失并不一定是由天文事件引起的。但是很难找到可供选择的解释。