2018年12月大学英语四级写作技巧(484)
大学英语四级写作部分占整套试卷的15%，大约是106.5分左右。可见大学英语四级作文是多么的重要。今天四六级考试网和考生们分享2018年12月大学英语四级写作技巧(484)-Hotter or Colder ?，请看下面的文章分享。英语四级美文：Hotter or Colder ?
1、Hotter or Colder ?
2、It was once thought that air pollution
3、affected only the area immediately around large cities
4、with factories and/or heavy automobile traffic.
5、Today, we know that although these are the areas
6、with the worst air pollution,
7、the problem is literally worldwide.
8、On several occasions over the past decade,
9、a heavy cloud of air pollution
10、has covered the entire eastern half of the United States
11、and led to health warnings even in rural areas
12、away from any major concentration of manufacturing
13、and automobile traffic.
14、In fact, the climate of the entire earth
15、may be affected by air pollution.
16、Some scientists feel
17、that the increasing concentration of carbon dioxide in the air
18、resulting from the burning of fossil fuels
19、(coal and oil)
20、is creating a “greenhouse effect” —
21、holding in heat reflected from the earth
22、and raising the world’s average temperature.
23、If this view is correct
24、and the world’s temperature is raised only a few degrees,
25、much of the polar ice cap will melt
26、and cities such as New York, Boston, Miami,
27、and New Orleans will be under water.
28、Another view, less widely held,
29、is that increasing particulate matter in the atmosphere
30、is blocking sunlight and lowering the earth’s temperature —
31、a result that would be equally disastrous.
32、A drop of just a few degrees could create something close to new ice age
33、and would make agriculture difficult
34、or impossible in many of our top farming areas.
35、At present we do not know for sure
36、that either of these conditions will happen
37、(though one recent government report
38、prepared by experts in the field concluded
39、that the greenhouse effect is very likely).
40、Perhaps, if we are very lucky,
41、the two tendencies will offset each other
42、and the world’s temperature will stay about the same
43、as it is now.
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