61.Which of the following is a typical symptom of the bends?
A.A twisted body.
B.A gradual decrease in blood supply.
C.A sudden release of nitrogen in blood.
D.A drop in blood pressure.
62.The purpose of Rothschild's study is to see
________.
A.how often ichthyosaurs caught the bends
B.how ichthyosaurs adapted to decompression
C.why ichthyosaurs bent their bodies
D.when ichthyosaurs broke their bones
63.Rothschild's finding stated in Paragraph 4
________.
A.confirmed his assumption
B.speeded up his research process
C.disagreed with his assumption
D.changed his research objectives
64.Rothschild might have concluded that ichthyosaurs
________.
A.failed to evolve an anti-decompression means
B.gradually developed measures against the bends
C.died out because of large sharks and crocodiles
D.evolved an anti-decompression means but soon lost it
【要点综述】 本篇为科普说明文,讲述鱼龙患减压病的原因和后果。Dr Rothschild通过实验推翻了关于鱼龙进化的一些猜测。
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