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