14、It's our duty to              people           too many trees．

A．stop；cutting down                                 B．prevent；to cut down

C．keep；cutting down                                   D．make；cut down

14、A

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It's our duty to              people           too many trees．

A．stop；cutting down                                 B．prevent；to cut down

C．keep；cutting down                                   D．make；cut down

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