单项选择题

The phrase "emanate from" in Paragraph 1 most probably means" ______".

A．thrive on
B．account for
C．originate from
D．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
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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