【GMAT考满分逻辑CR题库】Certain species of fish _真题_答案

题目内容

Certain species of fish swim in large clusters called schools, whose function is not entirely understood. Experiments have shown that individual fish, when removed from a school, demonstrate higher heart rates than those found within the school. Fish may experience stress at being separated from fellow members of their species, but an alternative explanation is that, for hydrodynamic reasons, swimming alone requires more physical exertion.

Which of the following, if discovered in an experiment, would support one of the two hypotheses and undermine the other?

A
When a school of fish is made to swim in turbulent conditions, the heart rate of each individual fish increases.
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B
When individual fish are isolated from their school but are permitted to swim in close proximity to others members of their species, their heart rates remain normal.
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C
When a school of fish is threatened by a predator, the heart rates of the fish within it will remain steady, while the heart rates of individual fish will increase significantly.
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D
When individual fish are removed from a school, they demonstrate higher heart rates than types of fish that do not normally swim in schools.
分析该选项
E
When a school of fish is threatened by a predator, the fish within it will demonstrate higher heart rates than individual fish isolated from their schools.
分析该选项

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正确答案: B

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