ChaseDream

标题: 逻辑狗狗里面一位构筑提到的关键词是sea lion的疑似题~ [打印本页]

作者: Eacineli 时间: 2016-7-7 21:20
标题: 逻辑狗狗里面一位构筑提到的关键词是sea lion的疑似题~

In the late 1980's, 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?

AKiller whales in the North Pacific usually prey on seals and sea lions but will, when this food source is scarce, seek out other prey.
BThere is no indication that substantial numbers of sea otters migrated to other locations from the North Pacific in the 1980's.
CAlong the Pacific coast of North America in the 1980's, sea otters were absent from many locations where they had been relatively common in former times.
DFollowing 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.
EThe North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.

明天考试，看见狗狗里面有一个这道题，感觉以前可能做过，就搜了一下，是GWD里的一道题，答案是A

欢迎光临 ChaseDream (https://forum.chasedream.com/)