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
D．it affects the normal flow of saliva
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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.
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
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