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[考试资讯] 求助GRE阅读大神解答

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发表于 2017-7-25 09:45 |显示全部楼层
Although many hypotheses have been proposed to explain why some plant communities are more
susceptible than others to invasion by nonnative species, results from field studies have been
inconsistent and no general theory of invasibility has yet emerged. However, a theory based on
fluctuating resource availability might integrate most existing hypotheses and successfully resolve
many of the apparently conflicting and ambiguous results of previous studies. The suggested
theory is that a plant community becomes more susceptible to invasion whenever there is an
increase in the amount of unused resources.
The diversity in the range of resource-release mechanisms could partly explain the absence of
consistent ecological correlates of invasibility. In particular, the theory predicts that there will be no
necessary relationship between the species diversity of a plant community and its susceptibility to
invasion, since near-complete exploitation can each occur in both species-rich and species-poor
communities. Though Lonsdale found a positive association between species richness and
invasion, this may arise from the tendency of diverse plant communities to be nutrient poor and
therefore more responsive to the effects of human-caused influxes of nutrients.

以上是原文
According to the author, the theory based on fluctuating resource availability might resolve
“apparently conflicting and ambiguous results” because
A. It explains how a particular circumstance can produce disparate effects.
B. It does not assume that all of the results are instances of the phenomenon that the theory is
intended to explain.
C. It predicts that seemingly minor variations in research methodology can have a dramatic effect
on results.
D. Its account is based on a statistical tendency rather than on the supposition that the results
arise from a causal connection.
E. It indicates why a similar outcome may be preceded by very different circumstances on different
occasions.

答案求大神解答。求解析。。
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发表于 2017-8-2 16:21 |显示全部楼层
同样问这一题,排除后剩下A和E,A是其解决了一到多的问题;E是其解决了多到一的问题;然后就不知道这个具体指什么该选哪个了。。。
该会员很懒,今天签到时没说话.
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发表于 2017-8-4 09:33 |显示全部楼层
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答案是E,先不同结果研究,后产生一个理论可以统一前面所有的理论,E是同义改写,问过老师了
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