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．Training given to musicians.B．How music prevents disease.C．How musicians create music.D．Studies on the benefits of music.
A．Training given to musicians.
B．How music prevents disease.
C．How musicians create music.
D．Studies on the benefits of music.
单项选择题
A．Her unique experience.B．Her future prospects.C．Her favourite job.D．Her lonely life.
A．Her unique experience.
B．Her future prospects.
C．Her favourite job.
D．Her lonely life.
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