单项选择题

Which of the following is NOT implied in the passage

A．The faculty of speech is inborn in man.
B．Children do not need to be encouraged to speak.
C．The child's brain is highly selective.
D．Most children learn their language in a definite stage.

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单项选择题

Frederick Ⅱ's experiment was drastic because______.

A．he wanted to prove that children are born with the ability to speak.
B．he ignored the importance of mothering to the infant.
C．he was unkind to the nurses.
D．he wanted to see if the children could die before they reached the age of one.

单项选择题

If the mother does not respond to her child's signals______.

A．the child will never be able to speak properly.
B．the child will stop giving out signals.
C．the child will invent a language of its own.
D．the child will make little effort to speak.