单项选择题

I'm sorry I'm late, I was held up in a traffic ______ .

A．block
B．group
C．jam
D．bunch
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单项选择题
Don't ______ blindly anything printed.
A．take
B．absorb
C．receive
D．accept
单项选择题
Air is the mixture of gases in which ______ the gas is oxyen.
A．not every of
B．not all
C．none of
D．all of
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