单项选择题

A．To stay in bed for two or three days.
B．To have a course of antibiotics.
C．To take some cough mixture.
D．To exercise more regularly.
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单项选择题
A．In the street.B．In a family swimming pool.C．In a public swimming pool.D．In a kindergarten.
A．In the street.
B．In a family swimming pool.
C．In a public swimming pool.
D．In a kindergarten.
单项选择题
A．Because they pollute air.B．Because they are natural hazards.C．Because they are increasing in numbers.D．Because people don’’t walk so often.
A．Because they pollute air.
B．Because they are natural hazards.
C．Because they are increasing in numbers.
D．Because people don’’t walk so often.
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