单项选择题

Except on official ()such as formal receptions, American society has a certain amount of informality.

A．cases
B．situations
C．events
D．occasions

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单项选择题
My boss insists on seeing everything in () before he makes a decision.

A．black and blue
B．red and blue
C．black and white
D．green and yellow
单项选择题
Our readers are comfortable with our clear, ()words that inform and entertain them.

A．conventional
B．concise
C．creative
D．crucial
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