Question

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

Answer 1

分析 砍樹(shù)對(duì)我們的環(huán)境有害．

解答 答案：harmful．結(jié)合句意是說(shuō)砍樹(shù)對(duì)我們的環(huán)境有害．結(jié)合前面的be動(dòng)詞is和所給單詞harm動(dòng)詞"傷害"，故用be harmful to對(duì)…有害，故答案是harmful．

點(diǎn)評(píng) be harmful （to）　　be harmful （to ） （對(duì)…）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(shū)對(duì)你的視力有害．
do harm to 對(duì)…有害
　　例：Eating a lot and exercising little do harm to your health．吃得多而鍛煉少對(duì)你的健康有害．