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(hù)科學(xué)，是研究減緩老齡化的進(jìn)程來(lái)延長(zhǎng)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(kuò)大，延長(zhǎng)"，protection意為"保護(hù)"；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(mén)研究生命保護(hù)的科學(xué)．故選C．

點(diǎn)評(píng) 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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