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.

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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.

单项选择题

By critical times (Line 4, Para 3) the author means______.

A．difficult period in the child's life.
B．moments when the child becomes critical towards its mother.
C．important stages in the child's development.
D．times when mothers often neglect their children.