首页
登录
职称英语
We all have offensive breath at one time or another. In most cases offensi
We all have offensive breath at one time or another. In most cases offensi
游客
2023-11-19
65
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 had 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/3201608.html
相关试题推荐
Awiseandfrugalgovernmentshall_______menfrominjuringoneanother.A、refra
Weallhaveoffensivebreathatonetimeoranother.Inmostcasesoffensi
Weallhaveoffensivebreathatonetimeoranother.Inmostcasesoffensi
Jim’sclose______tohisbrothermadepeoplemistakethemforoneanother.A、acc
Steven’s______closetohisbrothermadepeoplemistakethemforoneanother.A、
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesame
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesame
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesame
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesame
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesame
随机试题
Ididn’tseemuchduringtheflightbecausetherewas______cloud.A、toomanyB、
______atthedoorbeforeyoucomeintotheroom.A、HitB、KnockC、TouchD、Strike
AmongthegreatMiddleEnglishpoets,GeoffreyChaucerisknownforhisproducti
[originaltext]Whenastormiscoming,mostpeopleleavetheareaasquickly
中度脱水时体液的累积损失量约是(ml/kg):()A.120~150
在检测粉煤灰硅酸盐水泥的烧失量时,须测定灼烧试样的S03含量来校正试验结果。
下列交易或事项中,不产生应纳税暂时性差异的有( )。A.企业对销售的商品计提产品
下列哪类人群的主要营养问题是营养缺乏病( )。A.以动植物食物为主的平衡膳食结
“人不能两次踏进同一条河流”反映了()的哲学关系。A.现象和本质 B.量变
关于企业规划评估的说法,正确的是()。(新教材已删除)A.企业规划的评估依
最新回复
(
0
)