The text intends to tell us that

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The text intends to tell us that

A.the change of human height follows a cyclic pattern.

B.human height is becoming even more predictable.

C.Americans have reached their genetic growth limit.

D.the genetic pattern of Americans has altered.

参考答案:

C从全文中心来看,文章并不是以“predict human height”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。