四六级考试

【单选题】 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

网考网参考答案：B
网考网解析：
依据文章第九段第四句The trouble is they don't necessarily reach all offending germs．麻烦的是他们不能抑制所有有害病毒。可以判断B最符合题意，正确是B。 查看试题解析出处>>