单选题:Without the results of knowledge like spears, fire, and othe

  • 题目分类:英语(二)
  • 题目类型:单选题
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题目内容:
Without the results of knowledge like spears, fire, and other technologies, people __________.
A. could only survive for 7 days
B. would kill off all the animals
C. would be controlled by others  
D. would disappear from the earth
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