题文
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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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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