单选题：WhatdoestheHarvardfindingshow?

题目分类：卫生类
题目类型：单选题
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题目内容：

WhatdoestheHarvardfindingshow? A．Notalltoddlersusebabytalk.
B．Somechildrenneedmoreconversationthanothers.
C．Languagelearningtakesplaceinorderedsteps.
D．Notallbrainsworkinthesameway.

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