Cutting down trees isharmful to our environment．题目和参考答案——青夏教育精英家教网—

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

分析砍树对我们的环境有害．

解答答案：harmful．结合句意是说砍树对我们的环境有害．结合前面的be动词is和所给单词harm动词"伤害"，故用be harmful to对…有害，故答案是harmful．

点评 be harmful （to）　　be harmful （to ）（对…）有害
　　例1：Smoking is harmful to your health．吸烟有害于你的健康．
　　例2：Reading in bed is harmful to your eyesight．躺在床上看书对你的视力有害．
do harm to 对…有害
　　例：Eating a lot and exercising little do harm to your health．吃得多而锻炼少对你的健康有害．

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