单项选择题

Children who start speaking late ______.

A．may have problems with their hearing
B．usually pay close attention to what they hear
C．often take a long time in learning to listen properly
D．probably do not hear enough language spoken around them
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单项选择题
The problem of deciding at what point a baby's imitations can be considered as speech ______.
A．is not especially important because the change takes place gradually
B．is important because words have different meanings for different people
C．is one that can never 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 in often meaningless
单项选择题
It can be inferred from the passage that when a 7-month baby calls his or her mother mama ______.
A．he probably has known that mother should be called in this way
B．he probably does not know the sound stands for "mother"
C．he probably has already known the meaning of mama
D．it is the first meaningful sound pronounced by him
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