单项选择题

A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.
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单项选择题
A．The newcomer.B．The officer.C．The bus driver.D．The people in line.
A．The newcomer.
B．The officer.
C．The bus driver.
D．The people in line.
单项选择题
A．They couldn’t pay the rent for their apartment in the city.B．The house was closer to Rose’s new job.C．They didn’t like living in the city.D．Peter wanted a modem house.
A．They couldn’t pay the rent for their apartment in the city.
B．The house was closer to Rose’s new job.
C．They didn’t like living in the city.
D．Peter wanted a modem house.
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