单项选择题

A．In a library.
B．In a classroom.
C．In a teacher’’s office.
D．In a school canteen.
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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．Natural influences.B．Red tide organisms.C．Human activities.D．Dead aquatic animals.
A．Natural influences.
B．Red tide organisms.
C．Human activities.
D．Dead aquatic animals.
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