题目内容

Once harm is _______ to the eco-system, all species will ________, including man himself.
A．made; be in dangerB．done; be dangerous
C．caused; be endangeredD．done; be in danger
D
第一空短语do harm to 对…有害；第二空短语in danger处于危险中。 一旦做了对生态有害的事情所有的物种包括人类自己会处于危险中。选D
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