单项选择题
A.forest
B.vegetation
C.plants
D.trees
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单项选择题
A.onB.inC.byD.to
A.on
B.in
C.by
D.to
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单项选择题
A.restrainB.curbC.decreaseD.lessen
A.restrain
B.curb
C.decrease
D.lessen
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