单项选择题

By "critical times" in the third paragraph, the author means ______.

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

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单项选择题

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

A．their mothers do not respond to their attempts to speak
B．their mothers are not intelligent enough to help them
C．they do not listen carefully to their mothers
D．their brains have to absorb too much language at once

单项选择题

Frederick II's experiment was violent because ______.

A．he wanted to prove children are born with ability to speak
B．he paid no attention to the importance of mothering to the infant
C．he was unkind to the nurses
D．he wanted his nurses to say no mother tongue