单项选择题

A．A doctor.
B．A decorator.
C．A plumber.
D．An electrician.
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单项选择题
A．Make all the regions the same.B．Take control away from the regions during heavy traffic and bad weather.C．Buy new computers for all the airports.D．Study the problem of airport delays.
A．Make all the regions the same.
B．Take control away from the regions during heavy traffic and bad weather.
C．Buy new computers for all the airports.
D．Study the problem of airport delays.
填空题
M
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