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.
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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.
单项选择题
The author suggests in the last paragraph that______.
A．we should make full use of the Internet before security measures are strengthened
B．we should alert the most influential businessmen to the importance of security
C．influential businessmen should give priority to the improvement of the Net security
D．net inhabitants should not let security measures affect their joy of surfing the Internet
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