評(píng)論
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Questions 31 to 35 are based on the following passage.
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 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 evil 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 sulfur 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 (粘液). If the mouthwash contains alcohol-as most do-it can intensify the problem by drying out the mouth.
31. The phrase “emanate from” in Paragraph 1 most probably means “________”.
A) thrive on
B) account for
C) originate from
D) descend from
32. Which of the following is mentioned as one of the causes of bad breath?
A) Tooth trouble.
B) Sulfur rich food.
C) Too much exercise.
D) Mental strain.
33. According to the passage, alcohol has something to do with bad breath mainly because ________.
A) it keeps offending bacteria from reproducing
B) its smell adds to bad breath
C) it kills some helpful bacteria
D) it affects the normal flow of saliva
34. Mouthwashes are not an effective cure for bad breath mainly because ________.
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
35. We can infer from this passage that ________.
A) offensive breath can’t easily be cured
B) elderly people are less offended by bad breath
C) heavy drinkers are less affected by bad breath
D) offensive breath is less affected by alcohol
Questions 36 to 40 are based on the following passage.
“Welcome to the U.S.A.! Major Credit cards accepted!”
By the millions they are coming no longer the tired, the poor, the wretched mass longing for a better living. These are the wealthy. “We don’t have a budget,” says a biologist from Brazil, as she walks with two companions through New York City’s South Street. “We just use our credit cards.”
The U.S. has long been one of the world’s most popular tourist destinations, but this year has been exceptional. First there was the World Cup, which drew thousands from every corner of the globe; then came the weakening of the U.S. dollar against major currencies. Now the U.S., still the world’s superpower, can also claim to be the world’s bargain basement (廉價(jià)商品部). Nobody undersells America these days on just about everything, from consumer electronics to fashion clothes to tennis rackets. Bottom retail prices-anywhere from 30% to 70% lower than those in Europe and Asia-have attracted some 47 million visitors, who are expected to leave behind $79 billion in 1994. That’s up from $74 billion the year before.
True, not everyone comes just for brains. There remains an undeniable fascination in the rest of the world with all things American, nourished by Hollywood films and U.S. television series. But shopping the U.S.A. is proving irresistible. Every week thousands arrive with empty suitcases ready to be filled; some even rent an additional hotel room to hold their purchases. The buying binge (無節(jié)制) has become as important as watching Old Faithful Fountains erupt in Yellowstone Park or sunbathing on a beach in Florida.
The U.S. has come at last to appreciate what other countries learned long ago: the pouring in of foreign tourists may not always be convenient, but is does put money in the bank. And with a trade deficit at about $130 billion and growing for the past 12 months, the U.S. needs all the deposits it can get. Compared with American tourists abroad, visitors to the U.S. stay longer and spend more money at each stop; an average of 12.2 night and $1624 a traveller versus the American s’ four nights and $298.
36. From what the Brazilian biologist says, we know that tourists like her ________.
A) are reluctant to carry cash with them
B) simply don’t care how much they spend
C) are not good at planning their expenditure
D) often spend more money than they can afford
37. The reason why 1994 was exceptional is that ________.
A) it saw an unusually large number of tourists to the U.S.
B) it witnessed a drop in the number of tourists to the U.S.
C) tourism was hardly affected by the weakening of the U.S. dollar that year
D) tourists came to the U.S. for sightseeing rather than for bargains that year
38. By saying “nobody undersells America” (Line 4, Para. 3), the author means that ________.
A) no other country underestimates the competitiveness of American products
B) nobody expects the Americans to cut the prices of their commodities
C) nobody restrains the selling of American goods
D) no other country sells at a lower price that America
39. Why does the author assert that all things American are fascinating to foreigners?
A) Because they have gained much publicity through the American media.
B) Because they represent the world’s latest fashions.
C) Because they embody the most sophisticated technology.
D) Because they are available at all tourist destinations.
40. From the passage we can conclude that the U.S. has come to realize ________.
A) the weakening if the U.S. dollar can result in trade deficits
B) the lower the retail prices, the greater the profits
C) tourism can make great contributions to its economy
D) visitors to the U.S. are wealthier than U.S. tourists abroad
