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注意：1.词数80-100左右。 2.要求文章结构合理、内容通顺、句子连贯。 构思方法：这篇文章可以分两段写，一段写乱伐树木、乱扔垃圾、不加处理排放废物使得土地沙化、河水变脏、空气质量差、全球气温升高；另一段写合理建议。 例文： As time goes by, man is making the earth sick. Man did too many bad things that the environment is becoming worse and worse.They cut down trees and throw the litter everywhere.As a result,the forest becomes the sands.Above all, many factories pour the dirty things into the air.So most of the rivers become dirty and the air isn't as clear as that in the past at all.The temperature on the earth has got higher, too. I think we should save our homeland.Please don't throw the litter everywhere. And plant trees as many as possible. Let's make a contribution to the earth together!有关写保护环境的短文还可以从谈怎样保护环境角度上写。 例文： Today one of the serious problems is pollution.The environment around us is terrible.We must protect it. It's impolite to spit in public, such as: the library, the streets and so on. Please don't do it.We should neither draw pictures on the walls nor throw litter on the ground. Planting trees can make air fresh and stop the wind from blowing the earth away so we should plant trees every year. We'd better refuse to use onetime chopsticks. It can protect trees from cutting down. | 
