Thetextintendstotellusthat
A.thechangeofhumanheightfollowsacyclicpattern.
B.humanheightisbecomingevenmorepredictable .
C.Americanshavereachedtheirgeneticgrowthlimit.
D.thegeneticpatternofAmericanshasaltered.
正确答案:C从全文中心来看,文章并不是以“predicthumanheight”为中心的,而是在谈美国人身高问题。所以C选项为正确选项。



