【題目】Los Angeles Times reported that researchers may have found a way to ______ human life by changing certain genes, so that humans might expect to live twice as long.

A. extend B. preserve

C. multiply D. transform

【答案】A

【解析】A 延長(zhǎng)；B保存；保護(hù)；維持；C乘；使增加；使繁殖；D改變，使…變形，轉(zhuǎn)換。句意：《洛杉磯時(shí)報(bào)》報(bào)道研究者或許已經(jīng)找到了一種延長(zhǎng)人類壽命的方法。故選A。

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