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.
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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.
单项选择题
A．Some of his equipment was damaged in a fire. B．The training program he ran was a failure. C．Two of his employees committed theft. D．Two of his workers were injured at work.
A．Some of his equipment was damaged in a fire.
B．The training program he ran was a failure.
C．Two of his employees committed theft.
D．Two of his workers were injured at work.
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