单项选择题

It can be inferred from the passage that when a 7-month-old baby calls his 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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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 is often meaningless
单项选择题
According to the second paragraph, a baby's first noises are ______.
A．a sign that he means to tell you something
B．a reflection of his moods and feelings
C．an imitation of words spoken by adults
D．an early form of language
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