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    3．Life         science，also known as anti-aging research，is the study of slowing down the processes of aging to lengthen both the maximum and average lifespan．（　　）
    A．expectationB．extensionC．protectionD．security

    分析 以抗衰老研究闻名的生命保护科学，是研究减缓老龄化的进程来延长人类寿命的最大化和平均寿命．

    解答 答案：C．
    expectation意为"期望"；extension"伸展，扩大，延长"，protection意为"保护"；security意为"安全"；根据后面内容的解释the study of slowing down the processes of aging to lengthen both the maximum and average lifespan可知这是一门研究生命保护的科学．故选C．

    点评 区分好名词的词义辨析．熟悉他们的意义和用法．

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