题目内容

Up to now, no one has come up with a（n）       explanation of why dinosaurs died out, and it remains a mystery．
A．astonishingB．amusingC．convincingD．puzzling
C

试题分析：A．astonishing 令人惊讶的，B．amusing令人发笑的，C．convincing令人信服的，D．puzzling令人困惑的，句意：直到现在，没有人给出一个令人信服的解释为什么恐龙会灭绝，这仍然是和迷。所以选C。
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文中共有10处错误，每句中最多两处.错误涉及一个单词的增加、删除或修改。
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删除：把多余的词用斜线（＼）划掉。
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