We should do some things to protect the environment．For example，we shouldn’t________too many trees．
| A．cut down |
| B．write down |
| C．grow up |
| D．pick up |
We should do some things to protect the environment．For example，we shouldn’t________too many trees．
| A．cut down |
| B．write down |
| C．grow up |
| D．pick up |
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