首页
登录
职称英语
We all have offensive breath at one time or another. In most cases offensive
We all have offensive breath at one time or another. In most cases offensive
游客
2023-11-24
29
管理
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 (唾液) 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 (硫化物).
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 (黏液). If the mouthwash contains alcohol--as most do-it can intensify the problem by drying out the mouth. [br] Mouthwashes are not an effective cure for bad breath mainly because ______.
选项
A、they can’t mask the bad odor long enough
B、they can’t get to all the offending bacteria
C、their strong smell mixes with bad breath and makes it worse
D、they can’t cover the thick layers of mucus
答案
B
解析
细节理解题。文章最后一段倒数第三句说The trouble is they don’t necessarily reach all offending germs.虽然漱口药具有杀死细菌的效用,也无法接触到大多数细菌。综上所述,选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3213854.html
相关试题推荐
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Anewsurveyshowsthatsocialnetworkshavebecomeahotbedofoffensivewo
Yoga,theancientpracticeofpostures,breathingandmeditation,isgainin
Yoga,theancientpracticeofpostures,breathingandmeditation,isgainin
Yoga,theancientpracticeofpostures,breathingandmeditation,isgainin
Yoga,theancientpracticeofpostures,breathingandmeditation,isgainin
随机试题
EnglishBusinessLetterFormatI.Demandsofstationery—businesses:—thefirst
THEBLENDINGOFTHEUNITEDSTATESForyears,Jo
驾驶机动车在雾天行车要开启雾灯。()
AsystematictextbookevaluationisNOT
A.穿心莲B.薄荷C.广藿香D.石斛E.麻黄叶粉末镜检可见钟乳体的药材是
香园枳实药材顶端花柱残基周围隆起的环圈,称为A.金钱眼B.金钱环C.金井玉栏D.
对于110(66)kV及以上电压等级新建、改建变电站,在中性或酸性土壤地区,接地
贷款发放前,应落实有关贷款发放条件,其主要包括( )。A.确保借款人首付款已全额
关于地方人大常委会,下列哪一说法是错误的?()A.常委会主任召集和主持常委会会
某印染厂工人,40岁,工龄约15年。某日下班后突感到头痛、头晕,口唇及指端发绀,
最新回复
(
0
)