单项选择题

A．Every ten minutes.
B．At twenty to one.
C．Every half-hour.
D．Once a day.
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单项选择题
A．Environmental pollution and protection.B．Taxes and services for the public.C．Police efforts to protect people.D．People’’s attitude toward taxes.
A．Environmental pollution and protection.
B．Taxes and services for the public.
C．Police efforts to protect people.
D．People’’s attitude toward taxes.
单项选择题
A．In the morning.B．In the afternoonC．At noon.D．At night.
A．In the morning.
B．In the afternoon
C．At noon.
D．At night.
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