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

A

【解析】

試題分析：考查動(dòng)詞辨析。A.延伸；擴(kuò)大；B.保存；保護(hù)；C.使多樣化；D.改變；使..變形；轉(zhuǎn)換。句意為洛杉磯時(shí)報(bào)報(bào)道說研究者已經(jīng)找到了一個(gè)方法來延長(zhǎng)人的壽命——通過改變某種基因，所以人們可能期待能夠有兩倍的壽命。故選A

考點(diǎn)：考查動(dòng)詞辨析

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