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
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单项选择题
Mouthwashes are not an effective cure for bad breath mainly because _______.
A．they can't mask the bad odor long enough
B．they can't get to all the offending bacteria
C．their strong smell mixes with bad breath and makes it worse
D．they can't cover the thick layers of mucus
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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