2. 外语
  3. A has remained a puzzle B lacks sufficient evidence C is a university professor D was generated by the explosion E will kill man

A has remained a puzzle B lacks sufficient evidence C is a university professor D was generated by the explosion E will kill man

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问题 A has remained a puzzle
B lacks sufficient evidence
C is a university professor
D was generated by the explosion
E will kill many animals
F are attacked by aliens
The gigantic explosion that occurred a hundred years ago______.
选项
答案A
解析 句意：一百年前发生的这场大爆炸到今天仍旧是个谜。根据首段末尾的“leaving ascientific riddle”可知选A。riddle对应选项中的puzzle。
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