首页
登录
职称英语
We all have offensive breath at one time or another. In most cases, offensiv
We all have offensive breath at one time or another. In most cases, offensiv
游客
2024-10-17
0
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 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 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 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. [br] According to the passage, alcohol has something to do with bad breath mainly because
选项
A、its smell adds to bad breath.
B、it keeps offending bacteria from reproducing.
C、it kills some helpful bacteria.
D、it affects the normal flow of saliva.
答案
D
解析
文章结尾部分提到了漱口水中酒精的作用——intensify the problem by drying out the mouth,由此可知酒精会影响唾液的正常流动,使嘴巴变干,[D]正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3804740.html
相关试题推荐
Weallhaveoffensivebreathatonetimeoranother.Inmostcases,offensiv
Weallhaveoffensivebreathatonetimeoranother.Inmostcases,offensiv
Weallhaveoffensivebreathatonetimeoranother.Inmostcases,offensiv
Weallhaveoffensivebreathatonetimeoranother.Inmostcases,offensiv
Weallhaveoffensivebreathatonetimeoranother.Inmostcases,offensiv
Hisheartwas______soviolentlythathecouldhardlycatchhisbreath.A、bounci
随机试题
Lifeiseverywherearoundus.Itisevidentinthehumingof【1】______
ScenicSpotsonSongshan(嵩山)Songshanhas20
NinetypercentofAmericansknowthatmostoftheircompatriotsareoverweig
[originaltext]Tea-drinkingwascommoninChinafornearlyonethousandyear
调查质量和结果可靠性受主持人水平和技巧影响很大的方法是A.专题小组讨论 B.观
房颤病人术前心室率最好维持在A.50次/分左右 B.60次/分左右 C.70
【教学过程】 活动一:激趣导入 教师出示版画作品,引导学生观看,并提问与普通绘画作品有什么不同? 学生交流回答,揭示课题《黑白世界》。 活动二:
《乡下人家》 小学语文《乡下人家》主要教学过程及板书设计
建设用地审批制度包括( )。A:建设用地预审 B:建设用地审批 C:国务院
吸人性颗粒物所产生的生物活性强弱取决于其( )。A.溶解度 B.挥发度 C
最新回复
(
0
)