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 hypothesis that the explosion was caused by a rock colliding with the Earth______.
选项
答案B
解析 句意：爆炸是由陨石撞击地球造成的假设缺乏足够的证据。根据第四段首句可知科学家们没有找到任何“陨石”的碎屑，所以这项假设缺乏足够证据，故选B。
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