5.Cutting down trees isharmful(harm) to our environment.

分析 砍樹對我們的環(huán)境有害.

解答 答案:harmful.結(jié)合句意是說砍樹對我們的環(huán)境有害.結(jié)合前面的be動詞is和所給單詞harm動詞"傷害",故用be harmful to對…有害,故答案是harmful.

點(diǎn)評 be harmful (to)  be harmful (to ) (對…)有害
  例1:Smoking is harmful to your health.吸煙有害于你的健康.
  例2:Reading in bed is harmful to your eyesight.躺在床上看書對你的視力有害.
do harm to 對…有害
  例:Eating a lot and exercising little do harm to your health.吃得多而鍛煉少對你的健康有害.

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