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The author asserts that many species have become extinct due to natural forces, therefore it is not our responsibility to spend great effort and sums of money jobs不能不提吧,修锐说题目里有and时,如A,B and C时,A,B,C都要提一下to save the species. The conclusion seems tempting on the basis that during long geological period many species have disappeared under the control of natural forces, especially before humanehuman exist. However, the arguer author更好一些,全篇统一,北美范文里多数是用speakerhas overlooked overlooks 一般现在时就行吧several important factors that human have done on the extinction of species.
It might be tempting to agree with the author that during the past long geological periods, many species have become extinct as a result of natural processes. Once the hegemonists on the earth, dinosaursFor example, dinosaurs, once the hegemonists on the Earth, died out overnight mysteriously under natural forces, which is are putatively accepted as a result of asteroid hitting the earth Earth虽然金山上有on the earth,但我觉得还是Earth较好,用google搜了一下,还是大写的多. Geologists provide the evidence that although there were over a hundred billion species on the earthEarth ten thousand years ago, there were only less than fifty billion left immediately prior to human existence.物种减少一半是因为asteroid幢地球后与dinosaurs一起灭绝的吗?如果不是,在Geologist前加Still,geologist It is clear that these species have disappeared as a result of natural processes. According to Darwin's theory, thousands of hundreds of species will naturally die out for lacking the adaptability to survive, which is a natural selective process. It is neither possible nor necessary to save these species. 这句话可以不要,因本段是论证人类存在前的物种灭绝的事实,去不去save都无济于事,主要是部分承认作者的观点,是自然的力量造成了许多物种的灭绝。但如果在该句前再加上一句说这种自然灭绝的过程在人类出现后也一直存在着,这句就可以要,而且逻辑更完整一些Thus, we have to face the fact that natural processes have eliminated many species through selection.
However, the foci would be too narrow if we over-emphasis on the natural processes, therefore overlooking the important role human have played in leading the species to extinction. Geologists tell us that the total number of species have reduced from ten billion上一段说less than fifty billion,现在却是10 billion,误差较大,核对一下数据来源, which is immediately before human existence, to less than 10 million这个10 million的时间?是现在?限定一下更完整, in a relatively short period of five thousand years. Comparing the rate of extinction before and after human existence,这个时间限定比较模糊(主要是after),人类存在后的多长时间?如果是人类刚存在的话,那不该是人类的原因 we can clearly see that humanity activity has greatly accelerated the extinction rate of the species. 上面的这个统计数据如果不是很清楚的话,不如不用,因为第二段已经用过该类型的证明手法,不如在下面再多加一两种,如沙漠化,或更加充分的论证人类对物种灭绝起的破坏作用,With certain activities, human have unconsciously exacerbated the environment on which the species rely to survive. For example, the effort to burn forests out for grazing and agricultural lands would force all of the species living in the forest to migrate. With the advances of industry revolutions, human are now affecting the environment more than ever, the air and water pollution serious, and the thickness of the ozonosphere above the anti arctic area at all time lows. Any one of these destructions alone can lead to the extinction of thousands of species, not to say all of them taking effect all together. Since it is human who have played more important role in leading the species to extinction, it is obviously our responsibility to save these species.
The effort for saving the species would be especially wise if we consider the fact that saving the species is equal to saving ourselves. Since the associations between species are extremely sophisticated, it is entirely possible that extinction of one species, as a prey will lead to the extinction of a predator which lives on that prey. Human, as a role of a species in nature, will inevitably be affected, when the other species die out. What would happen to human, suppose all of the plants have died out, no fish swimming in the river, and no birds flying in the sky? We should realize that while pollution can kill thousands of species, it can kill ourselves as well. Therefore we would have to take some actions in no time to restore the environment主题句有点太绝对了,应该说的确一些物种的灭绝是人类造成的,在我们力所能及的情况下我们应该挽救,而且当威胁到人类生存的时候,我们更应该倾力去做。
In the final analysis, the extinction of species is mainly due to human activity, and such activity can affect human as well. Therefore we should immediately take every effort to restore the environment and save the species.前后不太呼应,第二段毕竟还承认了自然导致物种灭绝,怎么现在一边倒了? 还是让步说全一点好。
总的来说第一次能在这么短 的时间内写出还是很羡慕,我还不行,限时达不到。
[ Last edited by 执着 on 2005-7-16 at 08:30 ] |
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