单项选择题

The quality infects had existed prior to( ).

A．shipment
B．ship
C．car
D．airplane
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( )is a major port of Germany.
A．Hamburg
B．Liverpool
C．Los Angeles
D．Panama City
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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