In the late 1980s, the population of sea otters in the North Pacific Ocean began to decline. Of the two plausible explanations for the decline—increased predation by killer whales or disease—disease is the more likely. After all, a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution-related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably.
Which of the following, if true, most seriously weakens the reasoning?
你觉得A不对的理由还是犯了MUST BE 的错误。判断是否WEAKEN的标准是问自己:该选项是否迫使作者重新考虑其观点或必须作出反应(见“考试时如何做逻辑题”)。就像该题,如果有人说了A的情况,作者必须出来澄清WALES是不吃SEA OTTERS的,否则他的观点就会受怀疑。E说的是seals and sea lions 分布较广,SEA OTTERS分布较集中。原文看不出它们活在不同水域。故无关,
A的意思为:WALES通常是吃那两种冬冬,但由于他们都给病死光光了,就可能吃sea otters ,从而造成sea otters 的began to decline。提出另外一个造成sea otters 减少的可能原因。所以WEAKEN了结论:那个病could(可能)have spread to sea otters,造成它的began to decline。我不明白A为何会加强结论