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1、2022年考博英语-桂林理工大学考试题库及模拟押密卷（含答案解析）1. 单选题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 causes.Until a few years ago, the most doctors could do was to counsel patients with bad breath about oral cl
2、eanliness. 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 evil smelling gases, the worst of which is hydrog
3、en 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 sulfur producing bacteria gain the upper hand, producing classic “morning breath”.Alcohol hunger, too much talking, breathing through th
4、e mouth during exercise anything that dries the mouth produces bad breath. So can stress, though its not understood why. Some peoples 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
5、 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 o
6、ften 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. Th
7、e 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 dont necessarily reach all offending germs. Most bacteria are well protected from mouthwash under thick layers
8、 of mucus (黏液). If the mouthwash contains alcoholas most doit can intensify the problem by drying out the mouth.6. The phrase “emanate from” in Paragraph 1 most probably means “_”.7. Which of the following is mentioned as one of the causes of bad breath?8. According to the passage, alcohol has somet
9、hing to do with bad breath mainly because_.9. Mouthwashes are not an effective cure for bad breath mainly because_.10. We can infer from this passage that_.问题1选项A.thrive onB.account forC.originate fromD.descend from问题2选项A.Tooth trouble.B.Sulfur rich food.C.Too much exercise.D.Mental strain.问题3选项A.it
10、 keeps offending bacteria from reproducingB.its smell adds to bad breathC.it kills some helpful bacteriaD.it affects the normal flow of saliva问题4选项A.they cant mask the bad odor long enoughB.they cant get to all the offending bacteriaC.their strong smell mixes with bad breath and makes it worseD.they
11、 cant cover the thick layers of mucus问题5选项A.offensive breath cant easily be curedB.elderly people are less offended by bad breathC.heavy drinkers are less affected by bad breathD.offensive breath is less affected by alcohol【答案】第1题:C第2题:D第3题:D第4题:B第5题:A【解析】6.词汇推断题。第一步，练习句中前后信息衔接，emanate from这个词前后连接的是
12、口气和嘴里的细菌，从这里推测，是因为嘴里的细菌所以才导致了口气，但是这句话中口气在前细菌在后，选项代入文意中便可排除A选项“在成长”、B选项“导致；解释”；C、D选项虽然在中文中同义，但是descend from表示从先辈那里遗传或者继承过来的，不符合原文语境，所以不选D选项“起源于”；所以答案C选项“发源于”正确。7.事实细节题。第一步，精准定位，定位到第五段第一二句Alcohol hunger, too much talking, breathing through the mouth during exercise anything that dries the mouth produc
13、es bad breath. So can stress, though its not understood why“酗酒，说话太多，运动时用嘴呼吸任何使口腔干燥的事物都会产生口臭。压力也是如此，虽然不知道为什么”，第二步综合理解，压力属于精神紧张的一种，所以答案选D选项“精神压力”。A选项“牙齿问题”，文章没有提及，属于无中生有，所以不选；B选项“富硫食物”，定位到第三段最后一句The bacteria emit evil smelling gases, the worst of which is hydrogen sulfide“这种细菌会散发出难闻的气体，其中最难闻的是硫化氢”，从这里
14、可知，不是富含硫的食物让人有口气，是细菌释放出来的含硫物质导致的口气，所以B不选，这里属于曲解原文；C选项“运动太多”，见正确选项，不是运动太多导致口臭，是运动的时候用嘴呼吸导致口臭，这里属于曲解原文。8.推理判断题。文章定位到第五段第一句话Alcohol hunger, too much talking, breathing through the mouth during exercise anything that dries the mouth produces bad breath“酗酒，说话太多，运动时用嘴呼吸任何使口腔干燥的东西都会产生口臭”以及第四段第一二句话Mouth bac
15、teria 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”“口腔细菌在没有空气的环境中繁殖。富含氧气的唾液可以减少它们的数量。例如，当我们睡觉时，唾液流减慢，产生硫的细菌占了上风，产生了经典的早晨口气”，由这里可知口腔细菌在没有空气的环境中繁殖，唾液是减少细菌数量的利器，但当我们口腔是处于干涩状态的时候，口腔里的唾液流就会减慢，从而口腔细菌就繁殖起来了。酒精会导致口腔变干从而唾液流减慢从而细菌滋生产生口气，由此可知答案选D选项“它影响唾液的正常流动”。A选项“它能阻止有害细菌的繁殖”，见正确选项解析，是唾液减少细菌繁殖，不是酒精，这里属于反向干扰；B选项“它的气味增加了口臭”，文章没有提及，属于反向干扰；C选项“它杀死了一些有益的细菌”，文章没有提及，属于反向干扰。9.事实细节题题。第一步，寻找句内线索，定位到最后一段倒数第三句话The trouble is, they dont
