GRE写作题库精讲:物种灭绝原因

　　GRE写作题库精讲之物种灭绝原因。本文整理关于GRE写作题目提纲精讲，为考生提供GRE作文范文写作思路和方法指导。希望对大家GRE写作提分有所帮助。以下是GRE写作题库精讲物种灭绝原因题目思路解析。GRE写作题库逐题精讲及issue提纲大全

　　GRE写作题库之GRE作文题目：物种灭绝原因

　　GRE写作精讲之提纲解析：

　　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." 121. 在过去不同的时期，很多物种的灭绝都是自然因素造成， 而并非人类行为。所以，现在我们花费很大的人力物力去拯救濒临灭绝的物种是没有多少价值的。

　　A. Natural processes did eliminate some species through natural selection; however, it did not break the balance of the ecosystem. /The first is essentially the Darwinian argument that extinction results from the inexorable process of so-called “natural selection” in which stronger species survive while weaker ones do not. B. Due to human processes, including pollution and exterminatory exploitation of natural resources, our natural environment is being threatened, and the extinction of rare species has been accelerated. C. Since the diversity of species is beneficial for human beings, measures must be adopted to protect endangered species. Better protection for the diversity of the planet’s creatures and plants could help shield human from diseases like AIDS, Ebola, SARS or bird flu and save billions of dollars in health care costs.

　　The statement raises a variety of issues about morality, conscience, self-preservation, and economics. On balance, however, I fundamentally agree with the notion that humans need not make “extraordinary” efforts—at the expense of money and jobs—to ensure the preservation of any endangered species. 2. On the other hand are two compelling arguments against placing a duty on humans to protect endangered species. 3. Secondly, many animal extinctions are due to natural forces which are far beyond our ability. The more money and jobs it would cost to save a certain species, the lower priority we should place on doing so.

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