单项选择题

A．30 minutes.
B．20 minutes.
C．1 hour.
D．40 minutes.
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单项选择题
A．Higher fever.B．Breathing difficulty.C．Chest pain.D．Stomachache.
A．Higher fever.
B．Breathing difficulty.
C．Chest pain.
D．Stomachache.
单项选择题
A．Children education.B．Alcohol sales.C．Environmental protection.D．None of the above.
A．Children education.
B．Alcohol sales.
C．Environmental protection.
D．None of the above.
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