单项选择题

A．To have a rest.
B．To raise more money.
C．To have cleaning work.
D．To save money.
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问答题
Compared with white or refined starchy foods, wholegrain foods are richer in________.
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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