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

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单项选择题By ...... challenges explanation (Para. 1, Line 2)the author means that______.

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

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