单项选择题

Are you positive that there's been no mistake

A．rational
B．reasonable
C．certain
D．bound
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单项选择题
I didn't ask because I was afraid of looking stupid.
A．foolish
B．boring
C．childish
D．exciting
单项选择题
The interview took place around the kitchen table and was very causal.
A．formal
B．informal
C．regular
D．irregular
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