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.
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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.
单项选择题
According to the passage, a conversation between two Americans may break down due to______.
A．one temporarily glancing away from the other
B．eye contact of more than one second
C．improperly-timed ceasing of eye contact
D．constant adjustment of eye contact
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