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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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
A．13 million.B．30 million.C．14 million.D．40 million.
A．13 million.
B．30 million.
C．14 million.
D．40 million.
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