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n vertebrates was an accidental development rather than the outcome of specialization or adaptation. 参考答案: B 这是一道归纳推导题。本题的正确答案在第四段的第一、二、三句。这三句话的内容暗示本题的正确答案是B,即动物的外型通常受环境要求和生理能力的影响。考生在解题时应注意提高对原文信息的归纳推导能力。----------------------------------------5Which of the following best describes the organization of the last paragraph of the text? A.New evidence is introduced to support a traditional point of viewB.Three explanations for a phenomenon are presented and each is disputed by means of specific information.C. Three hypotheses are outlined and evidence supporting each is givenD.Recent discoveries are described and their implications for future study are projected 参考答案: B 本题是一道段落结构识别题。尾段的第一句对所谈现象提出了三种解释,然后针对每一种解释进行科学上的否定。可见本题的正确答案是B。考生在复习中应该加强对段落结构的识别能力。