单项选择题

A．Their origins can no longer be traced.
B．Their wording may become different.
C．The values they reflect may change.
D．They may be misinterpreted occasionally.
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单项选择题
A．To enhance concentration. B．To calm themselves down. C．To show their impatience. D．To signal lack of interest.
A．To enhance concentration.
B．To calm themselves down.
C．To show their impatience.
D．To signal lack of interest.
单项选择题
A．The bad weather. B．The long night. C．The cold houses. D．The gloomy winter.
A．The bad weather.
B．The long night.
C．The cold houses.
D．The gloomy winter.
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