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Over the past decade, many companies had perfected the art of creating automatic behaviors—habits—among consumers. These habits have helped companies earn billions of dollars when customers eat snacks or wipe counters almost without thinking, often in response to a carefully designed set of daily cues."There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can"t figure out how to change people"s habits," said Dr. Curtis, the director of the Hygiene Center at the London School of Hygiene Tropical Medicine. "We wanted to learn from private industry how to create new behaviors that happen automatically."The companies that Dr. Curtis turned to—Procter & Gamble, Colgate-Palmolive and Unilever—had invested hundreds of millions of dollars finding the subtle cues in consumers" lives that corporations could use to introduce new routines.If you look hard enough, you"ll find that many of the products we use every day—chewing gums, skin moisturizers, disinfecting wipes, air fresheners, water purifiers, health snacks, teeth whiteners, fabric softeners, vitamins—are results of manufactured habits. A century ago, few people regularly brushed their teeth multiple times a day. Today, because of shrewd advertising and public health campaigns, many Americans habitually give their pearly whites a cavity-preventing scrub twice a day, often with Colgate, Crest or one of the other brands.A few decades ago, many people didn"t drink water outside of a meal. Then beverage companies started bottling the production of far-off springs, and now office workers unthinkingly sip bottled water all day long. Chewing gum, once bought primarily by adolescent boys, is now featured in commercials as a breath freshener and teeth cleanser for use after a meal. Skin moisturizers are advertised as part of morning beauty rituals, slipped in between hair brushing and putting on makeup."Our products succeed when they become part of daily or weekly patterns," said Carol Berning, a consumer psychologist who recently retired from Procter & Gamble, the company that sold $76 billion of Tide, Crest and other products last year. "Creating positive habits is a huge part of improving our consumers" lives, and it"s essential to making new products commercially viable."Through experiments and observation, social scientists like Dr. Berning have learned that there is power in tying certain behaviors to habitual cues through ruthless advertising. As this new science of habit has emerged, controversies have erupted when the tactics have been used to Sell questionable beauty creams or unhealthy foods. According to Dr. Curtis, habits like hand washing with soap ______

A. should be further cultivated
B. should be changed gradually
C. are deeply rooted in history
D. are basically private concerns

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The longest bull run in a century of art-market history ended on a dramatic note with a sale of 56 works by Damien Hirst, "Beautiful Inside My Head Forever", at Sotheby"s in London on September 15th 2008. All but two pieces sold, fetching more than £70m, a record for a sale by a single artist. It was a last victory. As the auctioneer called out bids, in New York one of the oldest banks on Wall Street, Lehman Brothers, filed for bankruptcy.The world art market had already been losing momentum for a while after rising bewilderingly since 2003. At its peak in 2007 it was worth some $65 billion, reckons Clare McAndrew, founder of Arts Economics, a research firm—double the figure five years earlier. Since then it may have come down to $50 billion. But the market generates interest far beyond its size because it brings together great wealth, enormous egos, greed, passion and controversy in a way matched by few other industries.In the weeks and months that followed Mr. Hirst"s sale, spending of any sort became deeply unfashionable. In the art world that meant collectors stayed away from galleries and salerooms. Sales of contemporary art fell by two-thirds, and in the most overheated sector, they were down by nearly 90% in the year to November 2008. Within weeks the world"s two biggest auction houses, Sotheby"s and Christie"s, had to pay out nearly $200m in guarantees to clients who had placed works for sale with them.The current downturn in the art market is the worst since the Japanese stopped buying Impressionists at the end of 1989. This time experts reckon that prices are about 40% down on their peak on average, though some have been far more fluctuant. But Edward Dolman, Christie"s chief executive, says: "I"m pretty confident we"re at the bottom."What makes this slump different from the last, he says, is that there are still buyers in the market. Almost everyone who was interviewed for this special report said that the biggest problem at the moment is not a lack of demand but a lack of good works to sell. The three Ds—death, debt and divorce—still deliver works of art to the market. But anyone who does not have to sell is keeping away, waiting for confidence to return. By saying "spending of any sort became deeply unfashionable" (Lines 1~2, Para. 3), the author suggests that ______

A. collectors were no longer actively involved in art-market auctions
B. people stopped every kind of spending and stayed away from galleries
C. art collection as a fashion had lost its appeal to a great extent
D. works of art in general had gone out of fashion so they were not worth buying

Over the past decade, many companies had perfected the art of creating automatic behaviors—habits—among consumers. These habits have helped companies earn billions of dollars when customers eat snacks or wipe counters almost without thinking, often in response to a carefully designed set of daily cues."There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can"t figure out how to change people"s habits," said Dr. Curtis, the director of the Hygiene Center at the London School of Hygiene Tropical Medicine. "We wanted to learn from private industry how to create new behaviors that happen automatically."The companies that Dr. Curtis turned to—Procter & Gamble, Colgate-Palmolive and Unilever—had invested hundreds of millions of dollars finding the subtle cues in consumers" lives that corporations could use to introduce new routines.If you look hard enough, you"ll find that many of the products we use every day—chewing gums, skin moisturizers, disinfecting wipes, air fresheners, water purifiers, health snacks, teeth whiteners, fabric softeners, vitamins—are results of manufactured habits. A century ago, few people regularly brushed their teeth multiple times a day. Today, because of shrewd advertising and public health campaigns, many Americans habitually give their pearly whites a cavity-preventing scrub twice a day, often with Colgate, Crest or one of the other brands.A few decades ago, many people didn"t drink water outside of a meal. Then beverage companies started bottling the production of far-off springs, and now office workers unthinkingly sip bottled water all day long. Chewing gum, once bought primarily by adolescent boys, is now featured in commercials as a breath freshener and teeth cleanser for use after a meal. Skin moisturizers are advertised as part of morning beauty rituals, slipped in between hair brushing and putting on makeup."Our products succeed when they become part of daily or weekly patterns," said Carol Berning, a consumer psychologist who recently retired from Procter & Gamble, the company that sold $76 billion of Tide, Crest and other products last year. "Creating positive habits is a huge part of improving our consumers" lives, and it"s essential to making new products commercially viable."Through experiments and observation, social scientists like Dr. Berning have learned that there is power in tying certain behaviors to habitual cues through ruthless advertising. As this new science of habit has emerged, controversies have erupted when the tactics have been used to Sell questionable beauty creams or unhealthy foods. The author"s attitude toward the influence of advertisement on people"s habits is ______

A. indifferent
B. negative
C. positive
D. biased

The longest bull run in a century of art-market history ended on a dramatic note with a sale of 56 works by Damien Hirst, "Beautiful Inside My Head Forever", at Sotheby"s in London on September 15th 2008. All but two pieces sold, fetching more than £70m, a record for a sale by a single artist. It was a last victory. As the auctioneer called out bids, in New York one of the oldest banks on Wall Street, Lehman Brothers, filed for bankruptcy.The world art market had already been losing momentum for a while after rising bewilderingly since 2003. At its peak in 2007 it was worth some $65 billion, reckons Clare McAndrew, founder of Arts Economics, a research firm—double the figure five years earlier. Since then it may have come down to $50 billion. But the market generates interest far beyond its size because it brings together great wealth, enormous egos, greed, passion and controversy in a way matched by few other industries.In the weeks and months that followed Mr. Hirst"s sale, spending of any sort became deeply unfashionable. In the art world that meant collectors stayed away from galleries and salerooms. Sales of contemporary art fell by two-thirds, and in the most overheated sector, they were down by nearly 90% in the year to November 2008. Within weeks the world"s two biggest auction houses, Sotheby"s and Christie"s, had to pay out nearly $200m in guarantees to clients who had placed works for sale with them.The current downturn in the art market is the worst since the Japanese stopped buying Impressionists at the end of 1989. This time experts reckon that prices are about 40% down on their peak on average, though some have been far more fluctuant. But Edward Dolman, Christie"s chief executive, says: "I"m pretty confident we"re at the bottom."What makes this slump different from the last, he says, is that there are still buyers in the market. Almost everyone who was interviewed for this special report said that the biggest problem at the moment is not a lack of demand but a lack of good works to sell. The three Ds—death, debt and divorce—still deliver works of art to the market. But anyone who does not have to sell is keeping away, waiting for confidence to return. The most appropriate title for this text could be ______

A. Fluctuation of Art Prices
B. Up to-date Art Auctions
C. Art Market in Decline
D. Shifted Interest in Arts

有一横截面面积为A的圆截面杆件受轴向拉力作用,在其他条件不变时,若将其横截面改为面积仍为A的空心圆,则杆:

A. 内力、应力、轴向变形均增大
B. 内力、应力、轴向变形均减小
C. 内力、应力、轴向变形均不变
D. 内力、应力不变,轴向变形增大

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