搜搜考试网这题逻辑应该选哪个?为什么?
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这题逻辑应该选哪个?为什么?
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.
(B) There is no indication that the sea otter population at any North Pacific location declined in the 1980s because of substantial numbers of sea otters migrating to other locations.
(C) Along the Pacific coast of North America in the 1980s,sea otters were absent from many locations where they had been relatively common in former times.
(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.
(E) The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.
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.
(B) There is no indication that the sea otter population at any North Pacific location declined in the 1980s because of substantial numbers of sea otters migrating to other locations.
(C) Along the Pacific coast of North America in the 1980s,sea otters were absent from many locations where they had been relatively common in former times.
(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.
(E) The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.
排除A 文中提到的seals and sea lions 是以传染病的例子举出来,没有提到killer whale的食物短缺.
排除C C很莫名其妙
D没有必然性,因为照传染病一说,sea urchins 也可能因此减少.
E也很莫名其妙
我觉得B最合理,是没提到substantial numbers of sea otters migrating to other locations.
排除C C很莫名其妙
D没有必然性,因为照传染病一说,sea urchins 也可能因此减少.
E也很莫名其妙
我觉得B最合理,是没提到substantial numbers of sea otters migrating to other locations.