根據(jù)提示填空：人們砍樹，燒樹使溫室效應(yīng)更嚴(yán)重，因為樹吸收有害氣體。大量砍樹也導(dǎo)
致洪水，因為樹幫助穩(wěn)固土壤，下雨時土壤吸收水分。
The burning and cutting down of trees is making the greenhouse effect（66）_________because trees take in（67）_________gases．It will also cause（68）_________because trees can help（69）_________soil together，and soil（70）_________water when it rains．
66．worse   67．harmful        68．floods         69．hold    70．a(chǎn)bsorbs
略
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