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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热门试题

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

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.