单项选择题

Which of the following is mentioned as one of the causes of bad breath

A．Tooth trouble.
B．Too much exercise.
C．Sulfur-rich food.
D．Mental strain.
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单项选择题
Mouthwashes are not an effective cure for bad breath mainly because.
A．they can't mask the bad odor long enough
B．they can't get to all the offending bacteria
C．their strong smell mixes with bad breath and makes it worse
D．they can't cover the thick layers of mucus
单项选择题
According to the passage, alcohol has something to do with bad breath mainly because______.
A．it keeps offending bacteria from reproducing
B．its smell adds to bad breath
C．it kills some helpful bacteria
D．it affects the normal flow of saliva
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