题目内容

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】

试题分析：考查动词辨析。A.延伸；扩大；B.保存；保护；C.使多样化；D.改变；使..变形；转换。句意为洛杉矶时报报道说研究者已经找到了一个方法来延长人的寿命——通过改变某种基因，所以人们可能期待能够有两倍的寿命。故选A

考点：考查动词辨析

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