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
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单项选择题
Representative samples( )taken by the inspector from the whole lot yesterday.
A．was
B．is
C．were
D．are
单项选择题
Portland is a city of( ).
A．Poland
B．Australia
C．U.S.A
D．New Zealand
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