单项选择题

Doctors have proved the following EXCEPT that ______.

A．smiling does good to health
B．laughter can be tolerated
C．there is a way to reduce pain
D．laughter can work the muscles in the feet
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单项选择题
The title of this passage could probably be ______.
A．Let Us Teachers Stop Work
B．Let Us Make Children Learn
C．Let Children Correct Their Exercises
D．Let Children Learn By Themselves
单项选择题
According to the writer, teachers in school should ______.
A．allow children to learn from each other
B．point out children's mistakes whenever found
C．correct children's mistakes as soon as possible
D．give children more book knowledge
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