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。

　　61．A　细节理解题。根据the bends可定位到首段。由“The consequence…is sharp pain and a bent body—thus the name.”可知答案，a bent body和a twisted body是同义转换。由第二句的“Nitrogen dissolved in his blood is suddenly liberated by the reduction of pressure.”可知，这是说the bends的形成原因，故C、D项错，而B项文章没有提及。

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