单项选择题

You very likely give other passengers a quick glance to size them up and to______ them that you mean no threat.

A．issue
B．assure
C．certify
D．rectify
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单项选择题
The______ the doctor faced was whether he should tell the patient the truth.
A．dilemma
B．paradox
C．junction
D．conflict
单项选择题
It was no ______ that his car was seen near the bank at the time of the robbery.
A．coincidence
B．convention
C．certainty
D．complication
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