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
医学
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
2013-12-14
32
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 sulfur-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.
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。答案在最后一段的第三四句“Some mouthwashes claim to kill the bacteria responsible for badbreath.The trouble is.they don’t necessarily reach all offending germs.”(一些漱口水声称能杀死引起口臭的细菌。问题是他们不可避免地无法杀死所有可恶的细菌。)
转载请注明原文地址:https://kaotiyun.com/show/B4U3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
女,34岁,阵发性腹痛4天,伴有恶心、呕吐,起病以来肛门未排便排气,3年前因胆囊结石行胆囊切除术,正值月经中期。查体:脉搏:120次/分,血压90/60mmHg,腹饱满,右侧腹部较对侧膨隆,有压痛、反跳痛及肌紧张。右下腹腔穿刺抽出少量暗红色液体。血红蛋白1
下列哪一项不是胆囊切除的适应证
A、Johnhastoomanyoptions.B、Aliceneedsapieceofadvice.C、Johnhasnotdecidedyet.D、Alicehasswitchedtomedicine.CJoh
Althoughspeechandwritingarethespecialmeansofcommunicatingofhumans,theinterchangealsotakesplaceinmanyotherway
Althoughspeechandwritingarethespecialmeansofcommunicatingofhumans,theinterchangealsotakesplaceinmanyotherway
Drinkingwaterinmanyareasofthedevelopingworldiscontaminatedwithbacteria.
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassicalandmedievalworlds,whiledur
Readingtooneselfisamodernactivitywhichwasalmostunknowntothescholarsoftheclassicalandmedievalworlds,whiledur
Thebasiccausesareunknown,althoughcertainconditionsthatmayleadtocancerhavebeen______.
随机试题
自动控制系统安全措施主要是防止雷击等自然灾害损坏系统和人的()造成的损坏。
Passengersshouldallowfor______traveltimetotheairportinrushhourtraffic.
甲方、乙方因一起经济纠纷案件诉至法院,法院判决乙方向甲方给付93万元。由于乙方不主动履行义务,甲方申请法院强制执行。执行时,由于执行人员对乙方极为不满,因此故意将乙方的98万元存款强行划拨,乙方要求法院赔偿因错误强制执行所造成的损失。对此,法院应如何处理?
石灰工业废渣稳定土基层施工的要点有()。
下列关于个人所得税的表述中,正确的是()。
如果旅游者在游览活动中走失,导游人员应立即向其他旅游者、景点工作人员及有关人员了解情况,分析走失者可能在何时、何处走失,并迅速组织全陪、领队及旅游者分头寻找。()
组织结构受到很多因素的影响和制约,下列说法不正确的是()。
在全国通用的烧伤补液公式中,下列正确的是()。
根据下表,回答以下问题。哪些运输方式在2014年11月的货物运输量占当月货物运输总量的比重超过上年同期水_________。
软件生命周期中的活动不包括()。
最新回复
(
0
)