单项选择题

A．They reduce a person’’s appetite.
B．They make a person less persistent in face of trouble.
C．They make a person’’s nervous system weak.
D．They make a person more vulnerable to disease.
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单项选择题
A．Set the dinner table.B．Change the light bulb.C．Clean the dining room.D．Hold the ladder for him.
A．Set the dinner table.
B．Change the light bulb.
C．Clean the dining room.
D．Hold the ladder for him.
单项选择题
A．We can do without railways.B．Trains have much in common with motorcars and planes.C．Motorcars and planes are not as good as trains.D．Trains are as good as motorcars and planes.
A．We can do without railways.
B．Trains have much in common with motorcars and planes.
C．Motorcars and planes are not as good as trains.
D．Trains are as good as motorcars and planes.
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