单项选择题

The third paragraph is mainly about ______.

A．the development of babies' early forms of language
B．the difficulties of babies in learning to speak
C．babies' strong desire to communicate
D．babies' intention to communicate

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单项选择题

By saying the fact... challenges explanation , the author means that ______.

A．no explanation is necessary for such a common case
B．no explanation has been made up to now
C．it's no easy job to provide a satisfying explanation
D．it's high time that an explanation was provided

单项选择题

From the passage we learn that ______.

A．early starters can learn to speak within only six months
B．children show a strong desire to communicate by making noises
C．imitation plays an important role in learning to speak
D．children have various difficulties in learning to speak