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 以抗衰老研究聞名的生命保護科學，是研究減緩老齡化的進程來延長人類壽命的最大化和平均壽命．

解答 答案：C．
expectation意為"期望"；extension"伸展，擴大，延長"，protection意為"保護"；security意為"安全"；根據(jù)后面內(nèi)容的解釋the study of slowing down the processes of aging to lengthen both the maximum and average lifespan可知這是一門研究生命保護的科學．故選C．

點評 區(qū)分好名詞的詞義辨析．熟悉他們的意義和用法．

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