单项选择题

A．Red.
B．Blue.
C．Green.
D．Purple.
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单项选择题
A．They will run out of coffee.B．They will successfully compete with gourmet coffee sellers.C．They will introduce new regular brands of coffee.D．They will lose some coffee business.
A．They will run out of coffee.
B．They will successfully compete with gourmet coffee sellers.
C．They will introduce new regular brands of coffee.
D．They will lose some coffee business.
单项选择题
Which of the following is mentioned as one of the causes of bad breath
A．Tooth trouble.
B．Sulfur-rich food.
C．Too much exercise.
D．Mental strain.
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