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
44
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.
We can infer from this passage that ______.
选项
A、offensive breath can’t easily be cured
B、elderly people are less offended by bad breath
C、heavy drinkers are less affected by bad breath
D、offensive breath is less affected by alcohol
答案
B
解析
文中第六段说Saliva flow gradually slows with age,the elderly have more bad breath trouble than younger people do,这是老龄必然带来的结果,因此老年人不会因为这些感到不快。
转载请注明原文地址:https://jikaoti.com/ti/FyqYFFFM
0
考博英语
相关试题推荐
Forseveralyears,scientistshavebeentestingasubstancecalledinterferon(干扰素),.apotentialwonderdrugthatisprovingtob
Peoplesufferingfrom_____prefertostayshutintheirhomesandbecomepanic-strickeninlargepublicbuildingsandopenfields
In1784,fiveyearsbeforehebecamepresidentoftheUnitedStates,GeorgeWashington,52,wasnearlytoothless.Sohehireda
Shefeltdizzyandhadto_____somethingtosteadyherself.
Dogsaresocialanimalsandwithoutpropertraining,theywillbehavelikewildanimals.Theywillspoilyourhouse,destroyyo
Yourboughtarefrigeratorinasupermarketthreedaysago.Butmuchtoyourdisappointment,itcouldnotbeproperlyoperatedwh
Stratford-on-Avon,asweallknow,hasonlyoneindustry—WilliamShakespeare—buttherearetwodistinctlyseparateandincreasingl
Inrecentyears,manyAmericansofbothsexesandvariousageshavebecomeinterestedinimprovingtheirbodies.Theyhavebecom
Researcherswhorefusetosharedatawithothersmay【51】otherstowithholdresultsfromthem,【52】astudybyhealth-policyanalys
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】commontoallanimals.Inabiologicallabo
随机试题
企业经营环境的变化直接影响到企业存在的方式以及以及企业的管理模式。当一个企业的组织模式“金子塔”形开始向扁平化转变时,下列哪项活动不能有力促进组织结构的扁平化()
简述三种艺术分类的方法。
极度衰弱、膀胱高度膨胀的患者,导尿时排空膀胱会引起
关于妊娠合并心脏病的治疗,正确的是
血管壁的止血过程中,启动内源凝血系统的因子是
手术室的一般照明在手术台四周布置,应采用不积灰尘的洁净灯具,光源一般选用下列哪一项色温的直管荧光灯?()
杆塔的地下部分称为电杆基础。它的基本作用是防止杆塔因受重力,风力,()单向拉力而下压,上拔或倾倒。
利润表的表体主要反映形成经营成果的各个项目和计算过程。()
根据下列资料,回答下列问题。下列选项中,表述错误的是:
Iwon’tseeyouoffattheairporttomorrow,soIwillwishyou______.
最新回复
(
0
)