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1、2022年考博英语-山西大学考前提分综合测验卷（附带答案及详解）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 surprising causes.Until a few years ago, the most doctors could do was to counsel patients with bad breath ab
2、out 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 smelling gases, the worst of which is hydro
3、gen 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 gains the upper hand, producing classic “morning breath”.Alcohol, hunger, too much talking, breathing through the
4、mouth during exerciseanything 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 pe
5、ople 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 oft
6、en 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
7、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 of
8、 mucus. If the mouthwash contains alcoholas most doit can intensify the problem by drying out the mouth.1.The underlined phrase “emanate from” in (Sent. 2, Para. 1) most probably means “（ ）”.2.Which of the following is mentioned as one of the causes of bad breath?3.According to the passage, alcohol
9、has something to do with bad breath mainly because（ ）.4.Mouthwashes are not an effective cure for bad breath mainly because（ ）.5.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 stra
10、in.问题3选项A.it keeps offending bacteria from reproducingB.its smell adds to bad breathC.it kills some helpfulD.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.t
11、hey 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】1.词义推测题。根据第一段第二句offensive breath emanates
12、 from bacteria in the mouth（口臭来自口腔中的细菌），可知C选项“源自”符合题意，故C选项正确。A选项“靠，以”，B选项“对负有责任；对做出解释；（比例）占有”，以及D选项“传下来”意思不符合。因此C选项正确。2.语义推测题。根据第五段第一、二句anything that dries the mouth produces bad breath. So can stress, though its not understood why（任何使口腔干燥的东西都会产生口臭。压力也是如此，尽管不知道为什么），可知精神紧张导致口臭，故D选项“精神紧张”正确。A选项“牙齿问题”：
13、根据第二段第一句，医生最多能建议有口臭的病人保持口腔清洁，可知口臭与口腔清洁有关，没有提到和牙齿问题有关。B选项“高硫的食物”：根据第三段第二、三句，细菌以食物中的蛋白质为食，并排放硫化物这种口臭中最难闻的气体，可知并不是高硫食物导致口臭。C选项“运动过度”：根据第五段第一句，运动时用嘴呼吸产生口臭，可知不是运动过多导致口臭。因此D选项正确。3.语义推测题。根据第三段第一句Bad breath can happen whenever the normal flow of saliva slows（只要唾液的正常流速放缓，就会有口臭）和第五段第一句Alcoholanything that dri
14、es the mouth produces bad breath（酒精任何使口腔干燥的东西都会产生口臭），酒精引发口臭，而口臭的原因就是唾液流速低于正常速度，可推断酒精影响唾液正常流动，故D选项“它影响唾液正常流动”正确。A选项“它能阻止致病细菌繁殖”：文章中没有提到任何方法阻止细菌繁殖，只有通过刷牙等清除细菌的方法。B选项“其气味加剧口臭”：根据第八段第二句，含有酒精的漱口水通过气味掩盖口臭，没有提到其气味加剧口臭。C选项“它能有效杀死细菌”：根据第八段第三、四句，漱口水可以杀死部分细菌，但不能杀死所有致病细菌，可知漱口水不能有效杀死细菌。因此D选项正确。4.语义推测题。根据第八段第四句Th
15、e trouble is they dont necessarily reach all offending germs（问题是它们不一定能接触到所有致病的细菌），the trouble交代这是漱口水不能有效治疗口臭的主要原因，故B选项“它们无法接触到所有致病细菌”正确。A选项“它们无法长时间掩盖难闻气味”：无法长时间掩盖气味是漱口水不能有效治疗口臭的表现。C选项“它们浓烈的气味和口臭味道混合后加剧口臭”：根据第八段最后一句如果漱口水中含有酒精大多数都含有会加剧问题，可知漱口水含有酒精并且加剧口臭。D选项“它们不能覆盖厚厚的黏液层”：根据第八段倒数第二句，大多数细菌在厚层黏液中，漱口水不能杀死
16、它们，没有说到为什么不能和漱口水能不能到达厚层黏液。因此B选项正确。5.细节判断题。根据第二段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.（直到几年前，医生能做的最多的就是建议有口臭的病人保持口腔清洁。现在他们正在寻找新的方法来治疗这种通常可以治愈的疾病），对于治愈口臭，前几年医生能做的有
