对于新，练习GRE填空题，GRE考试内容：GRE填空陷阱：外来物种的影响
GRE填空陷阱：外来物种的影响
The order applies to all Federal agency whose actions may affect the status of invasive species and requires agencies to identify such actions and to the extent practicable and permitted by law, and since invasive species severely reduce the number of native species and even (i) _____ their existence, the agency has determined and made public its determination that the benefits of such actions clearly outweigh the potential harm caused by invasive species; and that all feasible and (ii) ______ measures to (iii) ______ risk of harm of the introduction of invasive species will be taken in conjunction with the actions.
答案：BDI
题干当中加粗的部分表明"外来物种会减少当地物种的数量"。整个题干想表达的是，命令适用于所有的联邦机构，这些机构的行动可能会影响外来物种的状态，并且命令要求识别行动到可实行和被法律允许的程度。因为外来物种会减少当地物种的数量甚至(表递进)排除当地物种的存在，机构决定并公布了决定，这些行动的好处明显地超过了由外来物种导致的潜在危害，所有为了减少入侵物种的危害所采取的可信和谨慎的措施都会和这些行动一起实施。
2.Contrary to those who fear the impact of invasive species on native plants, the biologists contend that the threat posed to biodiversity by nonnative plants is often (i)______. For instance, a study of garlic mustard, a nonnative plant thriving in the forest, found that the garlic mustard abundance in forest plots is not (ii)______ the number of others species there.
答案：BE
这道题题干是在说与担心外来对本地植物的影响相反，所以根据contrary取反，我们可以预判出来后面是要说"外来物种对本地物种没有什么影响"。生物学家认为，外来植物对生物多样性的威胁经常是被夸大的。例如，对蒜芥(一种生长于森林的外来植物)的研究发现蒜芥在森林中的数量与其他物种的数量是无关的。
综合以上两道关于外来物种影响的题目，我们可以明确地看到，有的题目认为外来物种对当地物种有危害，然而也有题目说外来物种和当地的生物没有关系，也就是外来物种不会对当地物种造成有害影响。同学们在做题的时候一定要注意以题干中已有的信息为出发点和依据，忽略题干信息而根据自己的固有的想法做题是需要纠正的。
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