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．There are not accepted standards.B．There are too many schools.C．Decentralization brings much diversity.D．No one has critically studied the subject.
A．There are not accepted standards.
B．There are too many schools.
C．Decentralization brings much diversity.
D．No one has critically studied the subject.
单项选择题
A．She plans to apply for a part-time job.B．She’s too busy to run for class president.C．She wants the man to help her with her studies.D．She hasn’t considered running for class president.
A．She plans to apply for a part-time job.
B．She’s too busy to run for class president.
C．She wants the man to help her with her studies.
D．She hasn’t considered running for class president.
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