C．usually pay close attention to what they hear

　　D．often take a long time in learning to listen properly

　　答案　D

　　解析　细节理解题。根据第一段中的“...later starters are often long listeners.”可知答案选D项。

　　3．A baby’s first noises are ________.

　　A．an expression of his moods and feelings

　　B．an early form of language

　　C．a sign that he means to tell you something

　　D．an imitation of the speech of adults

　　答案　A

　　解析　细节理解题。根据第二段“...the first few months one or two noises sort themselves as particularly expressive as delight，pain，friendliness，and so on.”可知正确答案为A项。

　　4．The problem of deciding at what point a baby’s imitations can be considered as speech ________.

　　A．is important because words have different meanings for different people

　　B．is not especially important because the changeover takes place gradually

　　C．is one that should be properly understood because the meaning of words changes with age

　　D．is one that should be completely ignored because children’s use of words is often meaningless

　　答案　C

　　解析　细节理解题。根据第三段“...and it is clear that what a child means by a word will change as he gains more experience of the world.”可知C项为正确答案。

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