________（48）A.At three he knows about 1 000 words
________（48）
A.At three he knows about 1,000 words which he can put into sentences,and at four his language differs from that of his parents in style rather than grammar.
B.What was missing was good mothering.
C.Lots of information about benefits of baby signing and best ways to go about it can be found.
D.Insensitivity of the mother to these signals dulls the interaction because the child gets discouraged and sends out only the obvious signals.
E.If these sensitive periods are neglected,the ideal time for acquiring skills passes and they might never be learned so easily again.
F.And even more incredible is the young brain’s ability to pick out an order in language from the hubbub of sound around him,to analyze,to combine and recombine the parts of a language in novel ways.
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答案：A
该空前文提到了孩子年龄和语言学习之间的关系。该空应该延续这一话题。选项A3岁的孩子懂得1 000个单词，并且能够组成句子；到了4岁时，孩子的语言与其父母的语言在风格上而不是在语法上有所差异，正是对前文所述内容的延续，所以选项A是正确答案。