小编经过对历年四级作文真题分析总结发现,不论是四级写作还是六级写作,这其中有些内容是互通的。现在小编就针对这些比较有共性的问题为大家进行总结:①卷面必须整洁;②字数要适度;③全篇布局为三段式;④低级错误尽可能少。根据上述内容,希望考生们可以灵活运用,今天文都四六级和大家分享2020年上半年大学英语四级写作:空气污染,希望对您有所帮助。

上半年大学英语四级写作:空气污染

Hotter or Colder ?

It was once thought that air pollution affected only the area immediately around large cities with factories and/or heavy automobile traffic.Today, we know that although these are the areas with the worst air pollution,the problem is literally worldwide.On several occasions over the past decade,a heavy cloud of air pollution has covered the entire eastern half of the United States and led to health warnings even in rural areas away from any major concentration of manufacturing and automobile traffic.

In fact, the climate of the entire earth may be affected by air pollution.Some scientists feel that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect” —holding in heat reflected from the earth and raising the world’s average temperature.

If this view is correct and the world’s temperature is raised only a few degrees,much of the polar ice cap will melt and cities such as New York, Boston, Miami,and New Orleans will be under water.Another view, less widely held,is that increasing particulate matter in the atmosphere is blocking sunlight and lowering the earth’s temperature —a result that would be equally disastrous.A drop of just a few degrees could create something close to new ice age and would make agriculture difficult or impossible in many of our top farming areas.

At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely).Perhaps, if we are very lucky,the two tendencies will offset each other and the world’s temperature will stay about the same as it is now.

以上为2020年上半年大学英语四级写作范文,再答四级写作的时候,考生们应该做到写作思路清晰明了,有层次,可以适当增加长难句和复杂句式,不要求全篇华丽词汇,希望本篇分析能给同学们的写作提供些许思路,祝同学们取得好成绩。

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