单项选择题

About ________cars and dogs are destroyed each year.

A．6 million
B．15 million
C．30 million
D．1 million
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单项选择题
What is the purpose of the meeting in Luxembourg
A．To control patrol boats on the River Danube.
B．To end economic sanctions against Serbia.
C．To step up economic sanctions against Serbia.
D．To send police officers to search the river.
单项选择题
A．air traffic problems.B．safety improvement.C．the number of flights.D．flight training courses.
A．air traffic problems.
B．safety improvement.
C．the number of flights.
D．flight training courses.
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