单项选择题

What is exceptionally remarkable about a child is that______.

A．he owes his speech ability to good nursing
B．he has a brain more complex than an animal's
C．he can produce his own sentences
D．he is born with the capacity to speak

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单项选择题

The reason some children are backward in speaking is that ______.

A．they are unable to learn language rapidly
B．their mothers are not clever about a child
C．their mothers respond inadequately to their attempts to speak
D．they are exposed to too much language at once