题目内容
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
B. done; be dangerous
C. caused; be endangered
D. done; be in danger
D
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Once harm ______ to the environment, it takes years to have the system recovered.
| A．does | B．is done | C．will be done | D．be done |