According to the passage alcohol has something to do with bad breath mainly because______
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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 bacteria
D.it affects the normal flow of saliva
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正确答案:D
解析:文章第三段第一句指出:Bad breath can happen whenever the normal flow of saliva slows...当唾液分泌减慢时就会发生口腔异味。第五段第一句还告诉我们酒精可以口腔干燥,所以我们可以推断酒精会影响唾液的分泌,即D项,正确是D。
