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.
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单项选择题
A．Jack is new in Manchester.B．Jack was in a traffic jam just now.C．Jack arrived an hour earlier.D．Jack went to Manchester an hour ago.
A．Jack is new in Manchester.
B．Jack was in a traffic jam just now.
C．Jack arrived an hour earlier.
D．Jack went to Manchester an hour ago.
单项选择题
A．18%.B．40%.C．70%.D．17%.
A．18%.
B．40%.
C．70%.
D．17%.
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