ISSUE121 请各位指教怎么才能不写那么长，我时间不够啊，是不是好多废话，求狠拍！

子旋UID: 2196177

17 issue121   At various times in the geological past, many species have become extinct as a result of natural, rather than human, processes. Thus, there is no justification for society to make extraordinary efforts, especially at a great cost in money and jobs, to save endangered species."
Word:694
Many species evolved in the past and emerged as a new population. Others became extinct before we can make a clear view of them. It is possible that those extinct species cannot adapt in the new climate and loose the ability to survive; it also maybe a result of natural. But as the human factors existed, especially nowadays, we cannot deny the effect from human and the reflection of nature. So I certainly believe that it is worthy of making any effort to save endangered species.

Firstly, natural processes eliminated some species mostly in the past under the permission of the balance of the ecosystem. The natural processes can be divided into the two important ones: the natural disaster and the natural selection. Both of them lead to the extinction of endangered species. At one hand, the natural disaster, such as the sever change of the climate and the disease without forecast, may destroy the population of living species and make them at the edge of extinction. At the other hand, the natural selection predict the situation the lives faced at the various times. As Charles Robert Darwin stated, ”I have called this principle, by which each slight variation, if useful, is preserved, by the term Natural Selection”, the natural processes may sometimes effective in the evolution history and lead to the variation and vigorous of lives. Also, these natural processes, even may causing the extinction of some species, did not have a great impact on the destroy of natural balance.  

Second, as human eliminates most of the endangered species directly or indirectly these days, we have the responsibility to save them, the resource of this world or ours. In the first place, we have got a great number of living species from nature. With the growth of human population, our need cannot be satisfied with the same quantity of resources as we searched before. People hunter numerous animals for their food and the normal life things; they also cut down trees and get the precious plant for the energy use and other utilities. The precious animals and plants are all on the edge of extinction. As a survey reported, there are more than 10 species extinct each day. What’ more, people destroy the world and make the species extinct at a great extent. Their behaviors have a impact on the elimination in indirect means. For example, all kinds of toxin airs, such as carbon dioxide and sulfur dioxide, get away from the auto machines as the pollutants. They contaminate the environment on which all the species living depend. As the reasons above and the lives sphere also affect our lives, how can we pull the responsibility out and act as the innocent ones? We live in the only world, earth, but we are not the only inhabitants of earth.

The third and even more important, all the species should be valued and we may surfer without concerning the natural entity. All the species live depend on each other, including human. We have utilized some species, while most others remain still mysterious. It should be used properly in our way of exploring the unknown world and serves for us as the stimulation of problem solving. Take the genetic engineering for example, we use all kinds of genes from deferent animals to search for the most effective component to rebuild a system to express a kind of protein, which can be used as the immune injection. Some precious species would be extinct before we may have the chance to research them and consider their value. It is the wealth of us, also the earth. Adversely, we loose many opportunities to improve the environment and the excessive extinction of species leads to the natural unbalance. It at last brings us many disease and disasters with indeterminism.

Above all, though many species have become extinct as a result of natural, we humankinds are the main factor of affecting the natural world. Everyone should remain the conscious to improve the natural environment. As our behaviors may reflect on ourselves at last, we should on duty of saving the endangered species both for the balance of nature and ourselves.

dicmiUID: 183392

写的长不是错~~

赫赫

不过粗看了下，比如B3的genetic 的例子就太长了~~

winsome_luoUID: 2146848

我觉得文章的重点应该是论述
尽管有自然的因素,人类还是应该....
主要应该还是证明人有努力的必要,因此第一个分论点可以尽量简洁些,

子旋UID: 2196177

谢谢两位的点评啊,要限时了!