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
2012-07-22
29
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 mouths 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 not 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 mouthwash contains alcohol — as most do — it can intensify the problem by drying out the mouth.
Which of the following is mentioned as one of the causes of bad breath?
选项
A、Toothache.
B、Sulfur-rich food.
C、Mental strain.
D、Too much exercise.
答案
C
解析
文中第三段列举了几个引起offensive breath的原因,如hunger,alcohol等,随后又指出stress也会引起offensive breath,[C]正确。文中只是说运动期间breathing through the mouth(通过嘴巴呼吸)可能引起口臭,并不是说过量运动导致口奥,[D]不正确。
转载请注明原文地址:https://kaotiyun.com/show/sMmK777K
0
专业英语四级
相关试题推荐
Whatistheprobablerelationshipbetweenthemanandthewoman?
Intheearliesttimes,childrenneededtolearn______.
Everymemberofsocietyhastomakea______tostruggleforthefreedomofthecountry.
TheHistoricalSignificanceofAmericanRevolutionTheAmericanRevolutionrepresentsthelinkbetweentheseventeenthcent
AlthoughIaminperfecthealth,andinpossessionofavalidclass-oneCaliforniadrivinglicense,Iamrunning【C1】______prob
Underthepresentsystem,stateenterprisesmust______allprofitstothegovernment.
Naturally,inagroupofanimalsasdiverseasthesnakes,andwithsomanyvariedenemies,therearenumerousdefensivereactio
It’ssaidthemostexcitingkindofeducationisalsothemostpersonal.Nothingcan【C1】______thejoyofdiscoveringsomething
Whydidherneighborsgoupontheroof?
Afteranight’ssoundsleep,theclerkseemstobe______enoughtofinishtheheavytaskinseveralhours.
随机试题
A.胆俞B.膻中、气海C.太溪、肾俞D.足三里、脾俞心脾两虚所致的心悸除选主穴外还可配用
《传染病防治法》规定应予以隔离治疗的是( )。
患者男,46岁。建筑工人,入院时诊断为破伤风。以下与本病最有关的既往史是()。
某工地试验室的试验人员开展水泥标准稠度用水量试验,请根据你掌握的试验知识完成下列题目。以下关于代用法测定标准稠度用水量的描述,正确的有()。
按计税依据分类,税收分为()。
与许多两栖爬行类动物一样,主要生活在北美大陆上的锦龟出生时的性别完全取决于孵化时的温度。在较为温暖的巢穴中孵化的锦龟为雌性,而在较为凉爽的条件下,则会产出一群雄性锦龟。某研究小组日前建立数据模型推测出,如果全球变暖的趋势持续下去,只要平均气温升高1.1摄氏
王安石关于造就人才的纲领有哪些内容?
甲赌博成瘾,欠乙赌债2万元,向丙借高利贷3万元,乙和丙多次催要未果,遂劫持了甲的妻子,并威胁称,如果甲再不还钱的话就强奸甲妻。后乙趁丙出门时强奸了甲妻。下列说法正确的是
USB1.1和USB2.0的区别之一在于传输率不同,USB1.1的传输率是_______。
A、Becausetheycansavemuchmoneyinthisway.B、Becausethesoilispoorinnutrients.C、Becausefertilizerscanmakeplantsg
最新回复
(
0
)