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, althou
We all have offensive breath at one time or another. In most cases, offensive breath emanates from bacteria in the mouth, althou
admin
2015-06-27
69
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.
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://kaotiyun.com/show/hJXK777K
0
专业英语四级
相关试题推荐
Judgingfromrecentsurveys,moreexpertsinsleepbehavioragreethatthereisvirtuallyanepidemicofsleepinessinthenatio
______hadthetrainarrivedatthestationthanthepassengersrushedintothecarriages.
ThegenerationofAmericanswhoarenow(in1989)youngadultshasbeen,asoddasitsounds,deprivedoftheadversitythathas
Itisdesiredthathisorder______assoonaspossible.
Sugarlessyoghurtcouldhelpbeatbadbreath,toothdecayandgumdisease,sayscientists.Japaneseresearchersfoundeatingthe
You’dbetterlookatthedifficulty______.
VictimizationofaPersonwithaDisabilityAprimarydifferenceforapersonwithadisabilitywhobecomesacrimevictim
_____,heisappointedasgeneralmanagerofthecompany.
Shehadrecentlyleftajobandhadhelpedherselftocopiesofthecompany’sclientdata,whichsheintendedto______instartin
Sherarelyshowsherselfinpublic,______?
随机试题
某猪场30~40日龄保育猪发生以咳嗽和呼吸困难为主要症状的传染病,伴有关节肿大。剖检见心包炎,肺脏与胸壁粘连,腹腔组织器官表面覆盖纤维素性渗出物。此病可能是()。
《内经》说的阴阳属性之征兆是()
患者女,32岁,因畏寒、厌油、恶心呕吐、食欲缺乏、乏力就诊,诊断为甲型肝炎,收入院治疗,此患者应采用的隔离种类是()
放射性水平A类装修材料产销和使用范围不受限制。()
经济分析与财务分析的相同之处包括()。
根据《工伤保险条例》,下列费用中,不应由工伤保险基金支付的是()。
要将剪贴板存放的内容插入当前文档,应选择命令()。
实行从量定额与从价定律相结合的复合计税的计算公式为:应纳税额=销售数量×单位税额+销售额(或组成计税价格)×税率。()
所得税费用和应交所得税这两者有什么区别?
NarratorListentopartofadiscussioninalinguisticsclass.Nowgetreadytoanswerthequestions.Youmayuseyou
最新回复
(
0
)