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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:1202

Once harm is _______ to the eco-system, all species will ________, including man himself.

A.made; be in danger B.done; be dangerous
C.caused; be endangered D.done; be in danger
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Onceharmistotheecosystem,allsp