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
It is implied in the passage that ______.
A．parents can never hope to teach their children new sounds
B．children no longer imitate people after they being to speak
C．even after they have learnt to speak children still enjoy imitating
D．children who are good at imitating learn new words more quickly
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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