首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
We all have offensive breath at one time or another. In most cases, offensive breath emanates from bacteria in the mouth, althou
We all have offensive breath at one time or another. In most cases, offensive breath emanates from bacteria in the mouth, althou
admin
2013-01-25
38
问题
We all have offensive breath at one time or another. In most cases, offensive breath emanates from bacteria in the mouth, although there are other, more surprising causes.
Until a few years ago, the most doctors could do was to counsel patients with bad breath about oral cleanliness. Now they are finding new ways to treat the usually curable condition.
Bad breath can happen whenever the normal flow of saliva slows. Our mouth are full of bacteria feeding on protein in bits of food and shed tissue. The bacteria emit evil smelling gases, the worst of which is hydrogen sulfide.
Mouth bacteria thrive in airless conditions. Oxygen rich saliva keeps their numbers down. When we sleep, for example, the saliva stream slows, and sulfide producing bacteria gain the upper hand, producing classic "morning breath".
Alcohol, hunger, too much talking, breathing through the mouth during exercise-anything that dries the mouth produces bad breath. So can stress, though it’ s no understood why. Some people’ s breath turns sour every time they go on a job interview.
Saliva flow gradually slows with age, which explains why the elderly have more bad breath trouble than younger people do. Babies, however, who make plenty of saliva and whose mouths contain relatively few bacteria have characteristically sweet breath.
For most of us, the simple dry-mouth variety of bad breath is easily cured. Eating or drinking starts saliva and sweeps away many of the bacteria. Breakfast often stops morning breath. Those with chronic dry mouth find that it helps to keep gum, hard candy, or a bottle of water or juice around. Brushing the teeth wipes out dry-mouth bad breath because it clears away many of the offending bacteria.
Surprisingly, one thing that rarely works is mouthwash. The liquid can mask bad-breath odor with its own smell but the effect lasts no more than an hour. Some mouthwashes claim to kill the bacteria responsible for bad breath. The trouble is, they don’ t necessarily reach all offending germs. Most bacteria are well protected from mouthwash under thick layers of mucus. If the mouth wash contains alcohol--as most do--it can intensify the problem by drying out the mouth.
According to the passage, alcohol has something to do with bad breath mainly because ______.
选项
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
答案
D
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。
转载请注明原文地址:https://kaotiyun.com/show/sF1O777K
0
考博英语
相关试题推荐
Hisideasareinvariablycondemnedas____byhiscolleagues.
Therelationshipbetweenformaleducationandeconomicgrowthinpoorcountriesiswidelymisunderstoodbyeconomistsandpoliti
Therelationshipbetweenformaleducationandeconomicgrowthinpoorcountriesiswidelymisunderstoodbyeconomistsandpoliti
Terrorismhasbecomesowidespreadthatitisnowimpossibletodismissitastheactionofafewcrazypeople.Infact,terroris
Ineconomics,demandimpliessomethingslightlydifferentfromthecommonmeaningoftheterm.Thelayman,forexample,oftenus
Althoughhehasbecomerich,heisstillvery________ofhismoney.
CharlesIIwasanothermonarch____malignedbyVictorianhistorians.
Ayearagothefirmhadalossof4.3milliondollarsor20centsashareafterallnecessarydeduction.
OnehundredboatsbearingonemilliondesperateuninvitedimmigrantssetsailfromtheGanges(恒河)forthefabledcoastoftheF
OnehundredboatsbearingonemilliondesperateuninvitedimmigrantssetsailfromtheGanges(恒河)forthefabledcoastoftheF
随机试题
政策评估是一个________、________、__________的过程。
平静呼吸时胸式呼吸以哪里的活动为主
我国卫生部规定,一名供精者的精子最多只能提供给
违反会计职业道德的行为,同时也一定违反会计法律制度。()
甲股份有限公司(以下简称“甲公司”)2015及2016年发生了以下交易事项:(1)2015年4月1日,甲公司以定向发行本公司普通股2000万股为对价,自乙公司取得A公司30%股权,能够对A公司实施重大影响。当日,甲公司发行股份的市场价格为5元/股,另支付
()不是社会保障功能。
材料1小县城大手笔:河北正定斥150亿巨资恢复古城风貌河北正定是一个年财政收入只有6.5亿元的小县,提出要投资150亿元恢复古城风貌。正定县委此前提出了恢复古城风貌、提升产业水平以及实施文化资源与旅游资源整合的目标,计划将古城风貌恢复工
下列不符合人民警察仪容规定的一项是()。
【S1】【S7】
Drought,tsunami,violentcrime,financialmeltdown—theworldisfullofrisks.Thepoorareoftenmost【C1】______totheireffect
最新回复
(
0
)