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  3. In dozens of years, there are more cases of the invasion of alien species partly because Which of the following is TRUE of chem

In dozens of years, there are more cases of the invasion of alien species partly because Which of the following is TRUE of chem

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问题 In dozens of years, there are more cases of the invasion of alien species partly because
Which of the following is TRUE of chemical weapons of invasive species?
选项 A、It is difficult to find the chemical weapons of invasive species.
B、The most prominent chemical weapons of invaders explain their success.
C、The less chemical weapons invaders have, the more benign they become.
D、Most native plants don’t have the same chemical weapons of aliens.
答案B
解析 本题是细节题。由题干中的chemical weapons定位至第五段。第二句指出：他们就到图书馆查询这些植物的化学性质…，结合末句的“植物学家对哪些化合物有哪些作用都了如指掌，因此这样对化学物质进行分类并不太难”可判断[A]不符合文意。第六段第二句提到；他们推断，具有高度入侵性的物种拥有土产植物所缺少的“化学武器”，对这种化学武器，害虫、寄生虫及其他植物都不能产生任何抵抗力。[D]中的aliens和 highly invasive species概念不同，无法得出该项结论，排除。末句指出：入侵性较弱的外来物种所具有的“武器库”可能至少同样存在于某些土产物种。这里指的不是chemical weapons的数量多少，而是本地物种和外来物种是否有同样的武器库影响入侵性，排除[C]。从第六段首句“然后，为了弄清外来物种的成功入侵是否得益于超级武器，这两位研究人员将已知外来物种的化学武器库同北美土生土长的植物化学武器库进行了比较。”和第七段首句“猜测因而得到了证实。”可知[B]符合文意，故为答案。
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