单项选择题

A．Her unique experience.
B．Her future prospects.
C．Her favourite job.
D．Her lonely life.
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单项选择题
A．Crowded air traffic.B．The large size of airplanes.C．Mistakes by air traffic controllers.D．Bad weather.
A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.
单项选择题
A．The presence of life-forms far below the Earth’s surface.B．The risk of infection from rare strains of bacteria.C．Fictional representations of a hidden underground world.D．The reliability of evidence collected by new drilling methods.
A．The presence of life-forms far below the Earth’s surface.
B．The risk of infection from rare strains of bacteria.
C．Fictional representations of a hidden underground world.
D．The reliability of evidence collected by new drilling methods.
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