5．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.

　　答案：A　推理判断题。根据第一段第二句话“The consequence, if the bubbles accumulate in a joint, is sharp pain and a bent body—thus the name”当血液中的氮气释放，聚集在关节处，结果就是剧烈的疼痛和身体的弯曲——这就是bends这个名字的由来。由此可知，bends的典型症状就是弯曲的身体。

　　6．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

　　答案：B　细节理解题。根据第三段第二句话“What he particularly wanted to investigate was how ichthyosaurs adapted to the problem of decompression over the 150 million years.”可得出答案。

　　7．Rothschild's finding stated in Paragraph 4

　　________.

　　A．confirmed his assumption

　　B．speeded up his research process

　　C．disagreed with his assumption

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