【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】試題分析：考查動詞辨析。A.延伸；擴大；B.保存；保護；C.使多樣化；D.改變；使..變形；轉(zhuǎn)換。句意為洛杉磯時報報道說研究者已經(jīng)找到了一個方法來延長人的壽命——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

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