考博考试

【单选题】 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

网考网参考答案：D
网考网解析：
文中第三段说Bad breath can happen whenever the normal flow of saliva slows，第四段说anything(包含前文提到的alcohol)that dries the mouth produces bad breath，可推断饮酒会影响唾液的正常流动，因此导致bad breath，选项D正确。 查看试题解析出处>>