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
练习册系列答案
相关题目
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