单项选择题

Portland is a city of ( ).

A．Poland
B．Australia
C．A
D．New Zealand
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单项选择题
The product was processed ( ) official veterinary supervision.
A．in
B．under
C．after
D．with
单项选择题
This area has been free from Foot—and—Mouth Disease ( ) two years.
A．for
B．in
C．after
D．before
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