六级经典阅读2
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 form
32. Which of the following is mentioned as one of the causes of bad breath？
A） Tooth trouble.
B） Sulfur-rich food.
C） To 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 ail 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
Passage 3
“Welcome to the U.S.A.！ Major Credit cards accepted！”
By the millions they are coming-no longer the tired， the poor， the wretched masses 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 comer 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 （廉价商品部）。 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 bargains. 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 （无节制） 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 it 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 12.2night and $1624 a traveller versus the Americans， four nights and $298.