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
The underlined phrase emanate from in (Sent. 2, Par
A．1) most probably means " ______ ".A. thrive onB. account forC. originate fromD. descend from
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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