[A] Study the following graphs carefully and write an essay in at least 150 words. [B] Your essay must be written neatly on

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问题     [A]  Study the following graphs carefully and write an essay in at least 150 words.
    [B] Your essay must be written neatly on ANSWER SHEET 2. (15 points)
    [C] Your essay should cover these three points:
    1. effect of the country’s growing human population on its wildlife
    2. possible reason(s) for the effect
    3. your suggestion for wildlife protection
   

选项

答案 It is clear from the first graph that the two hundred years from 1800 to 2000 saw a continuous increase in American population. In the second graph we can see that about 70 wildlife species had become extinct in a span of three hundred years and the situation was especially serious from 1800 to 1900, with about 50 to 60 species disappearing from the planet. With those two graphs, we can conclude that the growth of population in the United States is closely related to the drop in the number of wild species. In other words, the population explosion has given rise to the mass destructive effect on the wildlife. As we all know, the problem of the extinction of wildlife results from several factors. In the first place, the ever increasing population has taken up a large area of space, which used to be the home of many kinds of wildlife. Besides, the process of urbanization and industrialization has driven many kinds of wildlife away from their shelter to other places where they cannot survive due to the harsh environment. Concerning the extinction of the wildlife, some actions should be taken to tackle this problem. First of all, population should be controlled within a reasonable range with effective measures. Moreover, efforts should be made to protect our environment. In a word, it is not easy to find a solution to this frustrating problem.

解析     本文从结构上说,紧扣提纲,分为三段。第一段采用了先分后总的写作方法,先描写两幅图,进而做出比较,在段末得出两幅图之间的联系,这也是第一段的主题句。主题句出现在段落末尾还有一个好处,就是可以达到承上启下的作用,为第二段进一步深入论述这一现象的原因做准备。第二段承接上段,开头点明主题:这一现象的产生有几个原因。第三段段首为主体句,段落中提出两个建议,段尾进行总结,与段首形成呼应。
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