GMAT 考满分题库

Dolphins can swim at high speeds and achieve high acceleration in the water. In 1936, Sir James Gray calculated the force dolphins should be able to exert based on their physiology. He concluded that the propulsive force they were able to exert was not enough to explain how fast they swim and accelerate. In the 2000s, experimenters used special computer-enhanced measurements of the water in which dolphins were swimming. Through mathematical modeling, they were able to measure the force dolphins exert with their tails. As it turns out, dolphins exert considerably more force with their tails than Sir James Gray or anybody else ever expected. Therefore, the force exerted by their tails easily explains how fast they swim and accelerate.

In the argument, the two portions in boldface play which of the following roles?
  • AThis first is a piece of evidence supporting the main conclusion; the second is the main conclusion. 分析该选项
  • BThe first is a false conclusion based on an incorrect premise; the second is the revised conclusion drawn from the corrected premise. 分析该选项
  • CThe first is an opinion the author seeks to refute; the second is the opinion the author supports. 分析该选项
  • DThe first is a prediction that, if accurate, would provide support for the main conclusion of the argument; the second is the main conclusion. 分析该选项
  • EThe first is a generally held assumption; the second is a conclusion that violates that assumption. 分析该选项
正确答案: B

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