单项选择题

According to the author, three design types of previous researches are ______.

A．interrelated to one another
B．supplementary to one another
C．to be modified considerably
D．to be integrated into one design
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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 the spoken of adults
D．an early form of language
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
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