OG-17-647 求大神解答

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Between 1980 and 2000 the sea otter population of the Aleutian Islands declined precipitously. There were no signs of disease or malnutrition, so there was probably an increase in the number of otters being eaten by predators. Orcas will eat otters when seals, their normal prey, are unavailable, and the Aleutian Islands seal population declined dramatically in the 1980s. Therefore, orcas were most likely the immediate cause of the otter population decline.
Which of the following, if true, most strengthens the argument?
A
The population of sea urchins, the main food of sea otters, has increased since the sea otter population declined.
B
Seals do not eat sea otters, nor do they compete with sea otters for food.
C
Most of the surviving sea otters live in a bay that is inaccessible to orcas.
D
The population of orcas in the Aleutian Islands has declined since the 1980s.
E
An increase in commercial fishing near the Aleutian Islands in the 1980s caused a slight decline in the population of the fish that seals use for food.

这道题目答案选C。。。真的死活想不通啊。。A选项不是和Bible上的消除alternate cause一致吗

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emmahiggins09 发表于 2017-2-1 02:45
逻辑中有一种加强的方法是：

Conclusion: A causes B

好的！明白了！谢谢！！

emmahiggins09

回到家的皇帝 发表于 2017-1-31 22:26
有人能帮忙看看嘛

逻辑中有一种加强的方法是：

Conclusion: A causes B
Strengthen: If A does not happen, then B does not happen.

if orcas are unable to access sea otters, then the otters are not eaten 加强结论

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有人能帮忙看看嘛