单项选择题

We can infer from this passage that _______.

A．offensive breath can't easily be cured
B．elderly people are less offended by bad breath
C．heavy drinkers are less affected by bad breath
D．offensive breath is less affected by alcohol

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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

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