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 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.
单项选择题
A．On Thursday night.B．On Monday night.C．On Friday morning.D．On Thursday morning.
A．On Thursday night.
B．On Monday night.
C．On Friday morning.
D．On Thursday morning.
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