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, althoug
We all have offensive breath at one time or another. In most cases offensive breath emanates from bacteria in the mouth, althoug
admin
2017-01-15
40
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 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 gains 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, file 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.
We can infer from the 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
A
解析
推理题. 根据前文可知,大多数的口臭根源于口腔内的细菌,但要接触到并杀死这些细菌却十分困难,从而推断出此病不易治愈,所以[A]符合文意,故为正确答案。[B]“老年人很少受到口臭的困扰”与第六段第一句的文意不符,即唾液的流速随着年龄的增长而减缓,因而老年人比年轻人更易受到口臭的困扰,故排除;[C]“酗酒者不易受口臭的影响”和[D]“酒精对口臭没有多大影响”的说法均不正确,根据文意可知,酒精会影响唾液的正常流速而导致口臭,故均排除。
转载请注明原文地址:https://kaotiyun.com/show/uAJK777K
0
专业英语四级
相关试题推荐
Itisoftensaidthatpolitenesscostsnothing.Infact,itseemsthatalittlemorecourtesycould【C1】______businesses£5bil
Itisoftensaidthatpolitenesscostsnothing.Infact,itseemsthatalittlemorecourtesycould【C1】______businesses£5bil
Toerrishumanandtoforgivedivine,accordingtotheoldadage.Humanswhoforgiveare【C1】______toexperiencesignificantph
Warning:Holdingacellphoneagainstyourearorstoringitinyourpocketmaybehazardoustoyourhealth.Thisparaphrase
Aestheticthoughtofadistinctivelymodernartemergedduringthe18thcentury.Thewesternphilosophersandcriticsofthisti
Aestheticthoughtofadistinctivelymodernartemergedduringthe18thcentury.Thewesternphilosophersandcriticsofthisti
Recentyearshaveseenadramaticriseinthenumberofgraduatesfailingtorepaythestudentloans.Somestudentsarguethatt
His______brainandboundlessenergydrovehimfromonegreatinventiontoanother.
TheInternet,cellphones,palmtopcomputersandotherdigitaltechnologyallowsonetoquicklygain______toavarietyofinfo
Wheredidthisinterviewtakeplace?
随机试题
司法行政部门给小王颁发《律师资格证书》的行为属于行政许可行为。()
只有在环境资源分布均匀、种群中个体间没有彼此吸引或排斥的情况下,种群的内分布型才会出现()
A.1.27~2.35kPaB.2.94kPaC.2.94~4.90kPaD.2.45kPaE.1.76kPa门脉高压时,压力范围是
强直性脊柱炎特征性X线表现是
()可以是进行各种融资活动的固定场所,也可以没有固定场所,由参加交易者利用信息手段进行联系洽谈而完成融资交易。
案例一:我国某贸易公司A与美国公司B签署出口某大型机械设备的合同,其中大型设备的出口方为A,进口方为B,该大型设备价值500万美元,B公司根据合同先付定金100万美元给予A公司。合同约定A公司在2008年9月将此大型设备通过中国远洋运输公司运至美国某港口。
下列关于股权再融资的说法中,不正确的是()。
读下面两区域图,回答问题。图中M是世界著名港口,其地理位置的重要性包括()。①欧亚大陆桥西端②扼北海航线要冲③位于莱茵河人海口④经济腹地覆盖整个欧洲
2004年粮食产量比2003年提高了几个百分点?()
关于港口及相关设施,下列说法不正确的是()。
最新回复
(
0
)