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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单项选择题
( )can be issued by the entry-exit inspection and quarantine authorities of the P．R．of China.
A．B/L
B．Certificate of Origin
C．UC
D．Packing List
单项选择题
Representative samples( )taken by the inspector from the whole lot yesterday.
A．was
B．is
C．were
D．are
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