单项选择题

A．Forty hours.
B．Less than forty hours.
C．About seventy hours.
D．Less than twenty-five hours.
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单项选择题
A．External noise.B．Physiological noise.C．The effect of a cold.D．Psychological effect.
A．External noise.
B．Physiological noise.
C．The effect of a cold.
D．Psychological effect.
单项选择题
A．Have a balanced diet, fresh air, sunshine, enough rest and regular exercise.B．Visit the doctor and go to hospital regularly.C．Spend enough time watching others exercising at home or in a stadium.D．Realize the importance of physical and mental health.
A．Have a balanced diet, fresh air, sunshine, enough rest and regular exercise.
B．Visit the doctor and go to hospital regularly.
C．Spend enough time watching others exercising at home or in a stadium.
D．Realize the importance of physical and mental health.
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