单项选择题

案例分析题 Paragraph 4 talks about dialing "911". This number is probably ______.

A．the operator
B．an emergency number
C．a practice number for children
D．used to keep children calm
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单项选择题
Based on this passage, over-learning is good because ______.
A．simple information is used
B．children should know their names
C．it helps children act automatically
D．difficult information is only partly learned
单项选择题
From this passage, why is it a good idea for children to learn how to use the telephone
A．Children have fun dialing.
B．Emergencies happen without warning.
C．Children can wake their parents.
D．Dialing can help children with their math study.
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