单项选择题

Which of the following is mentioned as one of the causes of bad breath

A．Tooth trouble.
B．Sulfur-rich food.
C．Too much exercise.
D．Mental strain.
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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
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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