单选题In the author' s opinion, the Eskimo' s attitude toward his dogs is mainly due to ______.

单选题Researchers have recently found a connection between disease and stressful situations. To test this theory, psychologists are trying to find a link between the brain and the immune system. The immune system in our bodies fights the bacteria and viruses which cause disease. Therefore , whether or not we are likely to get various diseases depends on how well our immune system works. Biologists used to think that the immune system was a separate, independent part of our bodies. Recently, however, they have found that our brain can affect our immune system. This discovery indicates that there may be a connection between emotional factors, such as stress or depression, and illness. Although many doctors in the past suspected a connection between emotional factor and disease, they had no proof. Scientists have only recently discovered how the brain and the immune system function. Before this, no one could see a link between them. As a result, medical science never seriously considered the idea that psychological factors could cause disease. Several recent studies showed a connection between stress and illness, for example, researchers went to an American military school to study the students. They found that the sick students there had a lot of academic pressure and wanted to achieve, but they were not very good students. In a similar study, researchers studied a group of student nurses and found that the nurses who developed cold sores were the ones who described themselves as generally unhappy people. In addition to these results, which support their theory, researchers are also looking for proof that stress can damage the immune system. Researchers studied recently bereaved people, i. e. , people whose loved ones have just died, because they are more likely to become ill or die. By examining the immune system of recently bereaved people, the researchers made an important discovery. They examined some white blood cells which are an important part of the immune system. They were not functioning properly. The fact that they were not working correctly indicates that severe psychological stress, such as a loved one" s death, may damage an important part of our immune system. There is still no positive proof of a connection between the immune system and psychological factors. Researchers also say that the results of the studies on bereaved people could have a different explanation. For example, bereaved people often sleep and eat less than normal, or may drink alcohol or take medication. These factors can also affect the immune system. More research is needed to clearly establish the connection between the immune system and psychological factors.

单选题We know that many animals do not stay in one place. Birds, fish and other animals move from one place to another at a certain time. They move for different reasons; most of them move to find food more easily, but others move to get away from place that are too crowded. When cold weather comes, many birds move to warmer places to find food. Some fishes give birth in warm water and move to cold water to feed. The most famous migration (迁移) is probably the migration of the fish, which is called "salmon". This fish is born in fresh water but it travels many miles to salt water. There it spends its life. When it is cold, it returns to its birthplace in fresh water. Then it gives birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when they become too crowded. They move down to the low land. Sometimes they move to the seaside and many of them are killed when they fall into the sea. Recently, scientists have studied the migration of a kind of lobster (龙虾). Every year, when the season of the bad weather arrives, the lobsters get into a long line and start to walk across the floor of the ocean. Nobody knows why they do this, and nobody knows where they go. So, sometimes we know why humans and animals move from one place to another, but at other times we don"t. Maybe living things just like to travel.

单选题-- Would you like a cake or a banana? -- ______is OK. I really don't mind.

单选题I don"t know why ______ late for class.

单选题We should always ______ our opinion ______ facts. A. base ... in B. base ... on C. basis ... in D. basis ...on

单选题More and more, the operations of our businesses, governments, and financial institutions are controlled by information that exists only inside computer memories. Anyone clever enough to modify this information for his own purposes can reap big reward. Even worse, a number of people who have done this and been caught at it have managed to get away without punishment. It's easy for computer crimes to go undetected if no one checks up on what the computer is doing. But even if the crime is detected, the criminal may walk away not only unpunished but with a glowing recommendation from his former employers. Of course, we have no statistics on crimes that go undetected. But it's disturbing to note how many of the crimes we do know about were detected by accident, not by systematic inspections or other security procedures. The computer criminals who have been caught may have been the victims of uncommonly bad luck. Unlike other lawbreakers, who must leave the country, commit suicide, or go to jail, computer criminals sometimes escape punishment, demanding not only that they not be charged but that they be given good recommendations and perhaps other benefits. All too often, their demands have been met. Why? Because company executives are afraid of the bad publicity that would result if the public found out that their computer had been misused. They hesitate at the thought of a criminal boasting in open court of how he juggled (诈骗) the most confidential (保密) records right under the noses of the company's executives, accountants, and security staff. And so another computer criminal departs with just the recommendations he needs to continue his crimes elsewhere.

单选题The______function of language enables our language to talk about itself.

单选题The car is running ______ the speed of 120 kilometers an hour.A. inB. withC. atD. to

单选题{{B}}Passage Four{{/B}} Does money buy happiness? It's sometimes said that scientists have found no relationship between money and happiness, but that's myth, says University of Illinois psychologist Ed Diener. The connection is complex. In fact, very rich people rate substantially higher in satisfaction with life than very poor people do, even within wealthy nations, he says. "There is overwhelming evidence that money buys happiness," said economist Andrew Oswald of University of Warwick in England. The main debate, he said, is how strong the effect is. Oswald recently reported a study of Britons who won between ＄ 2,000 and ＄ 250,000 in a lottery (彩票拍奖). As a group, they showed a boost in happiness averaging a bit more than one point on a 36-point scale when surveyed two years after their win, compared to their levels two years before they won. Daniel Kahnman, a Nobel-Prize winner and Princeton economist, and colleagues, recently declared that the notion that making a lot of money will produce good overall mood is "mostly illusory". They noted that in one study, members of the high-income group were almost twice as likely to call themselves "very happy" as people from households with incomes below ＄ 20,000. But other studies, rather than asking for a summary estimate of happiness, follow people through the day and repeatedly record their feeling. These studies show less effect of income on happiness. Kahneman and colleagues said. There is still another twist to the money-happiness story. Even though people who make＄150,000 are considerably happier than those who make ＄ 40,000, It's not clear why, says psychologist Richard E. Lucas of Michigan State University. Researchers conclude that any effect of money on happiness is smaller than most daydreamers assume. "People exaggerate how much happiness is bought by an extra few thousand," Oswald said. "The quality of relationships has a far bigger effect than quite large rises in salary. It's much better advice, if you're looking for happiness in life, try to find the right husband or wife than to try to double your salary."

单选题At the end of the passage, the author implicates ______.

单选题Today, a high-level finance manager is just as likely to be a casual-looking 21-year-old as a balding executive. They have all either started their own companies or head a division within an existing firm. Most are under 30. Many of them share a tendency to think, speak and act fast. A detailed psychological study carried out recently on young business start-uppers aged over 25 revealed some common characteristics. The head psychologist at the University of Northumbria, Dr. Martyn Dyer-Smith, says "We found that they are opportunists. They have that entrepreneurial ability to take whatever is in front of them and turn it to their advantage. Any fool can make US $ 2 if they are in the right place at the right time, what is much harder is to actually plan their business. Originally I had a hypothesis that they planned a long time ahead, but I was wrong. What came across was a surprisingly short planning time. They took the opportunities as and when they came up." What cannot be underestimated, though, is self-confidence. "There is an amazing, almost abnormal, belief in themselves and (they) go very much on intuition." Says Dyer-Smith. While there is no typical pattern to what puts someone in the fast lane, there are some common threads: living up to the expectations of parents, channeling excessive amounts of energy into business, or finding a way to overcome personal barriers such as dyslexia (a reading disability) or learning difficulties, for example. The biggest surprise was the lack of young women. This was particularly unexpected, given the recent publicity about how girls are performing better than boys at school and becoming more confident and ambitious. But young women are opting for more secure careers rather than gambling with their future. With only a handful of female role models, some girls are not even considering being their own boss, let alone working on a concept fresh out of school, according to Dr Susan Vinnicombe, director of the center for the Development of Women Business Leader. "Women are going more into the corporate structure and doing well there. But perhaps the reason that they are not doing business for themselves at an earlier age is because women's attitudes are different. They perceive risk in a different way to men, who are not worried about borrowing huge amounts of money if it's going to help their business in the long term. Women are more cautious and more hesitant ," she says. Vinnicombe sees the lack of female entrepreneurs as part of a larger problem about women and the IT industry. Given that the computer world is one of the key areas for growth, where youth is an asset, it is "remarkable" that so many women are missing out on it. "The number of women in IT has actually dropped in the past 10 years. There is a real problem with attracting them to the IT industry, as girls don't seem to want to do it at university. It's become such a worrying issue that I know the government is looking into ways to attract them./

单选题{{B}}Passage Three{{/B}} Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that instead of feeding the dog or making garden compost(混合肥料) ,organic household waste could top up your home's electricity. Although such "microbial fuel cells" (MFCs)have been developed in the past, they have always proved extremely inefficient and expensive. Now Chris Melhuish and technologists at the University of the West of England(UWE)in Bristol have come up with a simplified MFC that costs as little as ￡10 to make. Right now, their fuel cell runs only on sugar cubes, since these produce almost no waste when broken down, but they aim to move on to carrot power. "It has to be able to use raw materials, rather than giving it a refined fuel," says Melhuish. Inside the Walkman-sized battery, a colony of E. coil bacteria produce enzymes that break down carbohydrates, releasing hydrogen atoms. The cell also contains chemicals that drive a series of redox, or reduction and oxidation reactions, stripping electrons from the hydrogen atoms and delivering them steadily to the fuel cell's anode(正极). This creates a voltage that can be used to power a circuit. To prove the MFC works, the researchers are using it to power a small light-sensitive robot. And when a number of the cells are connected in series, they could power domestic appliances, running a 40-watt bulb for eight hours on about 50 grams of sugar. Earlier MFCs were inefficient because they relied on energy-hungry filters and pumps. By experimenting with different anode materials, the UWE team have figured out how to make their system work: they dump the bacteria and redox chemicals directly into the cell. In its current form, the UWE team says its organic battery can produce eight times as much power as any previous MFC. But Melhuish wants to improve this, both by scaling it up and finding a better mix of redox chemicals.

单选题A: Haven't we met somewhere? B: No, Idon'tthinkso. A : Aren't you Kevin Grant? B : No, my name's Greg. Greg Brown. A:______ A. I've had enough, thank you. B. I' m sorry, but I' ve got nothing to let. C. Oh, I' m sorry. I was positive we' d met before. D. I think otherwise.

单选题The man confessed that he ______ a murder. A. did B. conducted C. committed D. performed

单选题Some scientists have suggested that earth is a kind of zoo or wildlife______for intelligent space beings, like the wilderness areas we have set up on earth to allow animals to develop naturally while we observe them.

单选题5 It was not until the accident happened ______.