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  3. In dozens of years, there are more cases of the invasion of alien species partly

In dozens of years, there are more cases of the invasion of alien species partly

游客2023-12-21  72
问题 In dozens of years, there are more cases of the invasion of alien species partly because [br] The difference between Dr. Cappuccino and Dr. Arnason’s hypothesis and the previous one is that
选项 A、the former mentions native predators of alien species.
B、the former may account for the invasion of certain aliens.
C、the latter explains the adaptation of the predators.
D、the latter may explore the pre-adaptation of the predators.
答案 B
解析 本题是由题干中的hypothesis定位至第三段。前两句对其他人的假设进行了解释：有人推想，外来物种摆脱了原先的掠食者，而在新的“家园”，现有的掠食者又没有发现它们也合口味，因此这些物种得以肆无忌惮地繁衍。然后指出这一观点的问题：这种观点好是好，不过没有解释为什么只有特定的外来物种才具有人侵性。该段末句指出Dr Cappuccino和Dr Arnason的猜测：这可能是因为土生土长的掠食者对外来物种所具有的防御机制有时产生“预适应”，有时又不产生。显然，先前假设存在的问题就是这两个人研究的内容，故[B]为答案。从该段可知，两种假设都提及predators，排除[A]。提到pre-adapted的是Dr Cappuccino和Dr Arnason，[D]属于张冠李戴，排除。而[C]则为该先前假设的部分内容，但无法得知是否为两种假设的区别所在，排除。
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