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
第一空短語do harm to 對…有害；第二空短語in danger處于危險中。 一旦做了對生態(tài)有害的事情所有的物種包括人類自己會處于危險中。選D
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