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GRE阅读模拟在线练习附答案一百九十一

2019-01-21 15:24:00来源：网络

　　对于GRE阅读部分，最好的练习资料就是模拟资料。通过模拟练习，可以让大家更好地发现自己在备考中的不足，重点攻克自己的短板内容，有效的提升阅读分数。下面新东方在线GRE频道为大家整理了详细的内容，供大家参考。

　　点击查看》》》【GRE阅读真题在线练习附答案汇总】

　　Although pathogenic organisms constantly alight on the skin, they find it a very unfavorable environment and,in the absence of injury, have great difficulty colonizing it. This "self-sterilizing" capacity of the skin results from the tendency of all well-developed ecosystems toward homeostasis, or the maintenance of the status quo.

　　Species that typically live in soil water, and elsewhere rarely multiply on the skin. Undamaged skin is also unfavorable to most human pathogens. The skin is too acid and too arid for some species. The constant shedding of the surface skin layers further hinders the establishment of invaders. The most interesting defense mechanism, however, results from the metabolic activities of the resident flora .Unsaturated fatty acids, an important component of the lipids in sebum collected from the skin surface inhibit the growth of several bacterial and fungal cutaneous pathogens. These acids are a metabolic product of certain gram-positive members of the cutaneous community, which break down the more complex lipids in freshly secreted sebum.

　　The primary purpose of the passage is to

　　A.offer an analysis of metabolic processes

　　B.detail the ways in which bacteria and fungi can be inhibited

　　C.describe mechanisms by which the skin protects itself against pathogens

　　D.analyze the methods whereby biological systems maintain the status quo

　　E.provide a specific example of the skin's basic defense against pathogens

　　The "resident flora" mentioned in lines 21-22 refer to

　　A.Unsaturated fatty acids (line 22)

　　B.sebum collected from the skin surface (lines 24-25)

　　C.bacterial and fungal cutaneous pathogens ( lines 26-27)

　　D.certain gram-positive members of the cutaneous community (lines 28-29)

　　E.more complex lipids (lines 30-31)

　　Among the natural defense of the skin against pathogenic organisms are all of the following EXCEPT the

　　A.dryness of the skin

　　B.acidity of the skin

　　C.tendency of the pathogens toward homeostasis

　　D.shedding of surface layers of the skin

　　E.metabolic breakdown of lipids

　　The author presents her material in which of the following ways?

　　A.Stating a problem and then supplying a solution

　　B.Presenting a phenomenon and then analyzing reasons for it

　　C.Providing information and then drawing a conclusion from it

　　D.Making a general statement and then arguing by analogy

　　E.Making an inference and then developing it by illustration

本文关键字: GRE阅读 GRE阅读练习

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