单项选择题

Uniform road signs are put to avoid frequent accidents at __________ turns.

A．abrupt
B．adverse
C．alien
D．apt
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单项选择题
His presentations are so __________ that we can't make sense of his real meaning.
A．arbitrary
B．ambiguous
C．straightforward
D．rigorous
单项选择题
Many guests were present at their wedding ceremony, even the __________ of that church was crowded.
A．corridor
B．lane
C．aisle
D．passage
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