请注意这题是有结论句的weaken题，结论句在此用the reasoning，注意你要去weaken 的东西是the reasoning。 这边的结论句因果关系如你所说的 disease ----- decline 你现在要去weaken的应该是这里的因果关系，D选项虽然说的有道理，但请问 和the reasoning有何关系?? 这就是大陆人所说的无关，注意问句用the这个字代表出题者假设你知道他所说的 reasoning所指为何。 ※ 引述《lovekyoko (匹兹堡的天空)》之铭言： : 22. (28829-!-item-!-188;#058&003748) : In the late 1980s, the population of sea otters in the North Pacific began to : decline. There are two plausible explanations for the decline: predation, : possibly by killer whales, or disease. Of these two, disease is the more : likely, since a concurrent sharp decline in populations of seals and sea : lions is believed to have been caused by disease, and diseases that infect : these creatures are likely to be able to infect sea otters also. : Which of the following, if true, most seriously weakens the reasoning? : (A) Killer whales in the North Pacific usually prey on seals and sea lions : but will, when this food source is scarce, seek out other prey. : D) Following the decline in the population of the sea otters, there was an : increase in the population of sea urchins, which are sea otters' main food : source. : 请教一下 : 答案是A 没啥问题 : 但我想知道D错哪 : 因为题目说有2可能原因 (1)predation (2)disease : 题目尾巴说是因为disease 所以反驳他不是因为disease是predation 这是A的 : D是错哪哩 urchins 增 otter减好像也没错阿 : -------------------------------------------------------- : Prep 1-23 : From 1978 to 1988, beverage containers accounted for a steadily decreasing : percentage of the total weight of household garbage in the United States. The : increasingly widespread practice of recycling aluminum and glass was : responsible for most of this decline. However, although aluminum recycling : was more widely practiced in this period than glass recycling, it was found : that the weight of glass bottles in household garbage declined by a greater : percentage than the weight of aluminum cans. : Which of the following, if true of the United States in the period 1978 to : 1988, most helps to account for the finding? : (A) Glass bottles are significantly heavier than aluminum cans of comparable : size. : C) Manufacturers replaced many glass bottles, but few aluminum cans, with : plastic containers. : 答案C 我来看伤咖的解释 重点在percentage : A是陈述事实 但我想问一下 我觉得我考试看到A就会想选 : 有人可以对A做一下解释吗 : 是不是 "事实" 的答案一定不能选 : 谢谢 --

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