单项选择题

Children who start speaking late ______.

A．may have problems with their hearing
B．usually pay close attention to what they hear
C．often take a long time in learning to listen properly
D．probably do not hear enough language spoken around them

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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 words spoken by adults
D．an early form of language