单项选择题

The possibility that the explosion was caused by sabotage cannot be______.

A. broken out
B. cancelled out
C. ruled out
D. wiped out
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单项选择题
The award ceremony will be the（）of the inaugural Singapore International Water Week that is held from 23 to 27 June 2008

A．twilight
B．insight
C．highlight
D．highland
单项选择题
The flashing red light served as a （）of danger ahead

A. predictor
B. caution
C. precaution
D. prevention
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