Critical Reasoning
试题详情
题目：
To prevent a newly built dam on the Chiff River from blocking the route of fish migrating to breeding grounds upstream, the dam includes a fish pass, a mechanism designed to allow fish through the dam. Before the construction of the dam and fish pass, several thousand fish a day swam upriver during spawning season. But in the first season after the project's completion, only 300 per day made the journey. Clearly, the fish pass is defective.
Which of the following, if true, most seriously weakens the argument?
选项:
A、
A. Fish that have migrated to the upstream breeding grounds do not return down the Chiff River again.
B、
B. On other rivers in the region, the construction of dams with fish passes has led to only small decreases in the number of fish migrating upstream.
C、
C. The construction of the dam stirred up potentially toxic river sediments that were carried downstream.
D、
D. Populations of migratory fish in the Chiff River have been declining slightly over the last 20 years.
E、
E. During spawning season, the dam releases sufficient water for migratory fish below the dam to swim upstream.
答案:
C
提问：
晕了，这题C选项是在削弱结论？不是由于fish pass导致的，而是大坝整体的建造导致的，虽然但是感觉也算是建造的一种坏处...A选项为什么不对呢？是因为这样没有可持续性，没法之前每年都thousands？B呢，为什么不能类比呢？无关还是加强还是削弱？E是无关还是加强？
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