单项选择题

The phrase "emanate from" in Paragraph I most probably means"______".

A．thrive on
B．originate from
C．account for
D．descend from
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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．Too much exercise.
C．Sulfur-rich food.
D．Mental strain.
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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