(P：Paragraph)

　　答案　A　[篇章结构题。文章第一段总述了三个方面(class，power，status)在定义阶层中的作用，第二段(class)、第三段(power)和第四段(status)分别叙述了它们的作用，文章结构为总—分式，所以选择A项。]

　　[学 以 致 用]

　　Wilderness

　　(2017·北京卷阅读理解D篇)“In wilderness(荒野)is the preservation of the world.”This is a famous saying from a writer regarded as one of the fathers of environ­mentalism.The frequency with which it is borrowed mirrors a heated debate on environmental protection：whether to place wilderness at the heart of what is to be preserved.

　　As John Sauven of Greenpeace UK points out，there is

　　a strong appeal in images of the wild，the untouched；more than anything else，they speak of the nature that many people value most dearly.The urge to leave the subject of such images untouched is strong，and the danger exploitation (开发)brings to such landscapes(景观)is real.Some of these wildernesses also perform functions that humans need—the rainforests，for example，store carbon in vast quantities.To Mr.Sauven，these“ecosystem services”far outweigh the gains from exploitation.

　　Lee Lane，a visiting fellow at the Hudson Institute，takes the opposing view.He acknowledges that wildernesses do provide useful services，such as water conservation.But that is

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