单选题：It is found by researchers that children at 14 months of age

题目分类：英语四级
题目类型：单选题
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题目内容：

It is found by researchers that children at 14 months of age. A．made no difference in how to communicate
B．were not abIe to convey abstract concepts
C．acquired many gestures from their parents
D．showed different abilities to communicate

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