科目: 来源:黑龙江省模拟题 题型:阅读理解
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科目: 来源:黑龙江省模拟题 题型:阅读理解
We might like to think we're not influenced by other people, but a new study into the group-buying
mechanisms(机制) - like those used on coupon(优惠券) sites such as Groupon and LivingSocial-reveals
that telling buyers who come later to the offer how many have already signed up increases the number
of purchasers.
Researchers at the University of Toronto's Rotman School of Management wanted to understand
why group buying sites that have entered the market recently have enjoyed greater success than those
operating a decade ago, such as Mercata and MobShop.
Earlier attempts typically left potential buyers waiting for days before confirming whether or not they
had got the offer they had signed up for.
"We think one of the reasons group-buying has been successful recently is because of the short tim
e horizon," says Rotman Professor Ming Hu, who co-wrote the study with Professor Mengze Shi and
PhD student Jiahua Wu. "It allows for a herding effect."
Another reason is the use of an information structure that discloses to later arrivals how many have
already signed onto the deal.
Researchers looked at two ways of designing the purchasing mechanism for a group buy: a
simultaneous mechanism, where no one knows how many buyers have come before them, and a
sequential(连续的) mechanism, where a second group of buyers has the advantage of knowing the
size of the first group.
The researchers' analytical(分析的) model shows the most successful mechanism is the sequential
one because it eliminates uncertainty for those coming later to the deal, and improves the confidence of
those who sign on early, as they're able to track the numbers of those who come after them.
"That boosts confidence," says Professor Hu, who teaches operations management. Deals for
"luxury" services, versus everyday items, work better in a group buy scenario(方案) because they offer
consumers a greater benefit.
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科目: 来源:陕西省同步题 题型:阅读理解
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科目: 来源:陕西省同步题 题型:阅读理解
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科目: 来源:陕西省同步题 题型:阅读理解
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科目: 来源:陕西省同步题 题型:阅读理解
根据短文内容,从下框的A~F选项中选出能概括每一段主题的最佳选项,选项中有一项为多余项. |
A. The likely reason of global warming B.Global warming-a world problem C.The fast increase in recent years D.What we should do to avoid greenhouse gases producing E.The earth is becoming warmer F.Different opinions on the cause of global warming |
1________ Is the world warming up? According to many reports, the answer is yes. Eleven of the hottest years since 1850 appeared between 1995 and 2006. Last year, the United Nation's Intergovernment Panel on Climate Change (IPCC) reported the earth was about 0.75 ? warmer than it was in 1850. While this doesn't sound like a lot, a small difference in average temperature can make a big difference in climate. During the last Ice Age, the planet was only about five degrees colder than now. 2.________ It's all about the speed at which temperatures are changing. In the past,temperatures moved up or down step by step. But in the 20th century, especially since 1976, temperatures have likely risen more quickly than during any century in the last 1000 years. Warming may bring improved harvests to northern countries such as Canada and Russia. However, many species won't like these conditions. They begin moving towards cooler places and cause lots of trouble to human world. 3.________ The IPCC reported that human activity is very likely responsible for increasing the greenhouse effect. Some gases cause the air to take in heat energy. Without the greenhouse effect, the earth's average temperature would be-18? rather than the present comfortable 14.6 ?. The main greenhouse gases are carbon dioxide, water vapor and some other gases. Burning oil,coal and waste add to the carbon dioxide, and it has increased 35% since 1850. 4.________ Many researchers have found that natural forces alone don't explain the temperature increases over the last 30 to 40 years. Their study shows that as carbon dioxide goes up, temperature will rise, too. But some scientists don't agree. They think the effect of human produced greenhouse gases is very small compared to the normal changes that the climate causes. 5.________ When asked whether humans are causing the world warming,Carl Wunsch, a professor at Massachusetts Institute of Technology says, "It seems very likely from what I've seen. Is it 100% sure? No. There is something to do with natural changes." Does that mean we should have a "waitandsee" attitude? No. He points out we buy house insurance not because we are sure our homes will be on fire, but because it's a danger we'd rather avoid. |
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科目: 来源:天津同步题 题型:完形填空
完形填空 | ||||
Many language learners think their pronunciation is good enough because their teacher doesn't correct them too often or because other students can _1_ them. Pronunciation is the area which is _2_ the least attention to in language learning. Most teachers _3_ just let their students speak and stop them 4 they say something completely wrong. Working on each student's pronunciation in class is just 5 . Also, the students who are 6 at pronunciation may be afraid that it will embarrass their classmates if they help 7 their mistakes. If you believe your pronunciation is good enough to 8 because it is good enough for your teacher and other students, you may be 9 when you actually go to a foreign country. One of my friends was the best student in his 10 class in Poland. When he went to America, he found Americans didn't understand 11 of what he said. Your pronunciation may still be quite 12 that of a native speaker. If this is the 13 , other people will find it 14 to understand what you're saying and will not be comfortable with you. 15 , don't think you can communicate in a foreign language 16 you've tested your skills on real native speakers. 17 for native or nearnative pronunciation so that people you talk to can communicate with you 18 . In order to achieve this goal, there's 19 that you will need to start thinking about pronunciation and 20 time on it. | ||||
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科目: 来源:天津同步题 题型:阅读理解
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科目: 来源:天津同步题 题型:阅读理解
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科目: 来源:天津同步题 题型:阅读理解
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