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
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
单项选择题
We can infer from this passage that ______.
A．offensive breath can't easily be cured
B．elderly people are less offended by bad breath
C．heavy drinkers are less affected by bad breath
D．offensive breath is less affected by alcohol
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