首页
登录
职称英语
We all have offensive breath at one time or another. In most eases offensive
We all have offensive breath at one time or another. In most eases offensive
游客
2024-10-10
0
管理
问题
We all have offensive breath at one time or another. In most eases 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. [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
细节题。文章最后一段倒数第三句“The trouble is they don’t necessarily reach all offending germs.”即虽然漱口药具有杀死细菌的效用,但它们也无法接触到大多数细菌,故[B]正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3794637.html
相关试题推荐
Weallhaveoffensivebreathatonetimeoranother.Inmosteasesoffensive
Weallhaveoffensivebreathatonetimeoranother.Inmosteasesoffensive
Weallhaveoffensivebreathatonetimeoranother.Inmosteasesoffensive
Weallhaveoffensivebreathatonetimeoranother.Inmosteasesoffensive
Weallhaveoffensivebreathatonetimeoranother.Inmosteasesoffensive
Peter______hisbreathinwonderwhenhesawtheChristmastreeinthesitting
Steven’sclose______tohisbrothermadepeoplemistakethemforoneanother.A、
Steven’s______closetohisbrothermadepeoplemistakethemforoneanother.A、
随机试题
[originaltext]W:Goodafternoon,Mr.Burke.Didyouhaveagoodlunch?M:Yes,
Market【C1】______donotcomenaturallytoChineseofficials.Forthepastfo
TheInternetAdvocateA)Contrarytothemannerinwh
驾驶机动车上路行驶,不允许超过限速标志标明的最高时速。()
众所周知,微波炉辐射具有某种杀伤力。早在二十世纪上半叶,研究人员就发现雷达发射的
治疗腰部冷痛重着,拘挛不可俯仰,舌淡,苔白,脉紧,除阿是穴、大肠俞、委中外,应选
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
犯罪法定最高刑为5年有期徒刑的,其追诉期限为( )。 A.5年 B.10年
对于符合贷款条件的客户,如其资金周转存在一定的周期性,在准确把握其还款能力的基础
共用题干 某工程项目的建设单位通过公开招标方式确定某施工单位为中标人,双方签订
最新回复
(
0
)