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【R10】
SOME RITUALS OF MODERN DOMESTIC LIVING VARY LITTLE THROUGHOUT THE DEVELOPED WORL
D. ONE SUCH IS THE MUNICIPAL REFUSE COLLECTION, USUALLY ONCE A WEEK, YOUR RUBBISH BAGS OR THE CONTENTS OF YOUR BIN DISAPPEAR INTO THE BOWELS OF A SPECIAL LORRY AND ARE CARTED AWAY TO THE LOCAL TIP. TO ECONOMISTS, THIS CEREMONY IS PECULIAR, BECAUSE IN MOST PLACES IT IS FRE
E. YES, HOUSEHOLDS PAY FOR THE SERVICE OUT OF LOCAL TAXES. 【R6】______YET THE MARGINAL COST OF RUBBISH DISPOSAL IS NOT ZERO AT ALL. THE MORE PEOPLE THROW AWAY, THE MORE RUBBISH COLLECTORS AND TRUCKS ARE NEEDED, AND THE MORE THE LOCAL COUNCIL HAS TO PAY IN LANDFILL AND TIPPING FEES. 【R7】______BUT AS DON FULLERTON AND THOMAS KINNAMAN, TWO AMERICAN ECONOMISTS, HAVE FOUND, THIS SEEMINGLY EASY APPLICATION OF ECONOMIC SENSE TO AN EVERYDAY PROBLEM HAS SURPRISINGLY INTRICATE AND SOMETIMES DISAPPOINTING RESULTS. IN THE PAST FEW YEARS, SEVERAL AMERICAN TOWNS AND CITIES HAVE STARTED CHARGING HOUSEHOLDS FOR GENERATING RUBBIS
H. THE COMMONEST SYSTEM IS TO SELL STICKERS OR TAGS WHICH HOUSEHOLDERS ATTACH TO RUBBISH BAGS OR CANS. ONLY BAGS WITH THESE LABELS ARE PICKED UP IN THE WEEKLY COLLECTIO
N. IN THE PAPER PUBLISHED LAST YEAR FULLERTON AND KINNAMAN STUDIED THE EFFECTS OF ONE SUCH SCHEME, INTRODUCED IN JULY 1992 IN CHARLOTTESVILLE, VIRGINIA, A TOWN OF ABOUT 40,000 PEOPL
E. RESIDENTS WERE CHARGED 80 CENTS FOR EACH STICKER. THIS MAY SOUND LIKE THE SENSIBLE USE OF MARKET FORCES. IN FACT, THE AUTHORS CONCLUDE, THE SCHEMES BENEFITS DID NOT COVER THE COST OF PRINTING STICKERS, THE STICKER SELLERS COMMISSIONS, AND THE WAGES OF THE PEOPLE RUNNING THE SCHEM
E. 【R8】______ THIS IS INEFFICIENT: COMPACTING IS DONE BETTER BY MACHINES AT LANDFILL SITES THAN BY INDIVIDUALS, HOWEVER ENTHUSIASTICALLY. THE WEIGHT OF RUBBISH COLLECTED IN CHARLOTTESVILLE FELL BY A MODEST 14% . 【R9】______THE ONE BRIGHT SPOT IN ALL THIS SEEMS TO HAVE BEEN A 15% INCREASE IN THE WEIGHT OF MATERIALS RECYCLED, SUGGESTING THAT PEOPLE CHOSE TO RECYCLE FREE RATHER THAN PAY TO HAVE THEIR REFUSE CARTED AWAY. BUT THE FEE MAY HAVE LITTLE TO DO WITH THE GROWTH IN RECYCLING, AS MANY CITIZENS WERE ALREADY PARTICIPATING IN CHARLOTTESVILLE'S VOLUNTARY RECYCLING SCHEM
E. 【R10】______TO DISCOURAGE DUMPING, FOR INSTANCE, LOCAL COUNCILS MIGHT HAVE TO SPEND MORE ON CATCHING LITTERS, OR RAISE FINES FOR LITTERING, OR CUT THE PRICE OF LEGITIMATE RUBBISH COLLECTIO
N. A. TRUE, THE NUMBER OF BAGS OR CANS COLLECTED DID FALL SHARPLY, BY 37% BETWEEN MAY AND SEPTEMBER 1992. BUT RATHER THAN BUY MORE TAGS, PEOPLE SIMPLY CRAMMED MORE GARBAGE — ABOUT 40% MORE INTO EACH CONTAINER.
B. THIS LOOKS LIKE THE MOST BASIC OF ECONOMIC MISUNDERSTANDINGS: IF RUBBISH DISPOSAL IS FREE, PEOPLE WILL PRODUCE TOO MUCH RUBBIS
H. THE OBVIOUS ECONOMIC SOLUTION IS TO MAKE HOUSEHOLDS PAY THE MARGINAL COST OF DISPOSING OF THEIR WAST
E. THAT WILL GIVE THEM AN INCENTIVE TO THROW OUT LESS AND RECYCLE MOR
E.
C. CITY AUTHORITIES ARE NOW CONSIDERING A PROJECT TO TEACH GOVERNMENT WASTE COLLECTORS THE SKILLS, SUCH AS WHAT RUBBISH TO COLLECT AND HOW TO CLASSIFY IT. IF APPROVED, THE PROJECT WILL HELP EASE THE FINANCIAL BURDEN OF THE CITY'S WASTE TREATMENT.
D. IT WOULD BE FOOLISH TO GENERALIZE FROM THIS ONE CASE, BUT THE MORAL IS CLEAR, ECONOMIC INCENTIVES SOMETIMES PRODUCE UNFORESEEN RESPONSES.
E. LESS PLEASING STILL, SOME PEOPLE RESORTED TO ILLEGAL DUMPING RATHER THAN PAY TO HAVE THEIR RUBBISH REMOVE
D. THIS IS HARD TO MEASURE DIRECTLY. BUT THE AUTHORS, OBSERVING THAT A FEW HOUSEHOLDS IN THE SAMPLE STOPPED PUTTING RUBBISH OUT, GUESS THAT ILLEGAL DUMPING MAY ACCOUNT FOR 30% — 40% OF THE REDUCTION IN COLLECTED RUBBIS
H.
F. BUT AT THE MARGIN THE PRICE IS ZERO: THE FAMILY THAT FILLS FOUR BINS WITH RUBBISH EACH WEEK PAYS NO MORE THAN THE ELDERLY COUPLE THAT FILLS ON
E.

A.
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Most of us tell one or two lies a day, according to scientists who study these things. And we rarely get caught, because the lies we tell are usually little ones:'l got stuck in traffic.' 'That color looks good no you.' 'I was just about to call.' But even the smallest fib may soon be systematically exposed, at least in the virtual World. Researchers at several universities are developing software that can detect lies in online communications such as instant messages e-mails and chatrooms. The ability to spot 'digital deception', as researchers call it, has never been more crucial. Today, much of our business and social life is conducted online, making us increasingly vulnerable. White collar criminals, sexual predators, scammers, identity thieves and even terrorists surf the same Web as the rest of us. Conventional lie detectors look for physiological signs of anxiety—a bead of sweat or a racing pulse— but online systems examine only the liars words. 'When were looking at language, were looking at the tool of the lie,' says Jeff Hancock, all assistant professor of communication and a member of the faculty of computing and information science at Cornell University. Hancock, who recently received a $ 680,000 grant from the National Science Foundation to study digital deception, says there is a growing body of evidence that the language of dishonest messages is different than that of honest ones. For example, one study led by Hancock and due to be published this spring in Discourse Processes found the deceptive e-mail messages contained 28 percent more words on average and used a higher percentage of words associated with negative emotions than did truthful messages. Liars also tend to use fewer first-person references(such as the pronoun 'I')and more third-person references(such as 'he' and 'they'). This may be the liars subconscious way of distancing himself from his lie. More surprising, Hancock and his colleagues have observed that the targets of liars also exhibit distinctive language patterns. For instance, people who are being deceived often use shorter sentences and ask more questions. Even though they may not be aware that they are being lide to, people seem to exhibit subconscious suspicions. To identify the patterns of deceit, Hancock has developed an instant-messaging system at Cornell that asks users to rate the deceptiveness of each message they send. The system has already collected 10,000 messages, of which about 6 percent qualify as patently deceptive. Eventually the results will be i-ncorporated into software that analyzes incoming messages. For now, the Cornell researchers are working only with the kinds of lies told be students and faculty. It remains to be seen whether such a system can be scaled up to handle 'big' lies, such as messages sent by con artists and terrorists. Fortunately, the research so far suggests that people lie less often in e-mail than face-to-face or on the phone. Perhaps this is because people are reluctant to put their lies in writing, Hancock speculates. 'An e-mail generates multiple copies,' he says. 'It will last longer than something carved in rock.' So choose your words carefully. The internet may soon be rid not only deceit but also of lame excuses
The digital polygraph conducts testing based on_____.

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