【題目】_______ trees harms the living conditions of human beings.
A.Cutting down
B.Cut down
C.Cutting off

【答案】A
【解析】cut down“把……砍到”;cut off“切除;切割”。句意為:砍伐樹木危害人類的生存條件?芍懦鼵;動名詞可作主語,故選A。

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