单项选择题

How much is the discount

A． $ 10.
B． $ 6.
C． $ 16.
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单项选择题
A．smileB．journeyC．beginningD．end
A．smile
B．journey
C．beginning
D．end
单项选择题
How many chemical changes take place in the brain
A． 10,000 every second.
B． 6,000,000 every minute.
C． 100,000 every minute.
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