单选题I was ______ about the exam I couldn't get to sleep. A. such worried...that B. worried so...that C. worried such...that D. so worried...that

单选题In the villages of the English countryside there are still people who remember the good old days when no one bothered to lock their doors. There simply wasn"t any crime to worry about. Amazingly, these happy times appear still to be with us in the world"s biggest community. A new study by Dan Farmer, a gifted programmer, using an automated investigative program of his own called SATAN, shows that the owners of well over half of all World Wide Web sites have set up home without fitting locks to their doors. SATAN can try out a variety of well-known hacking tricks on an Internet site without actually breaking in. Farmer has made the program publicly available, amid much criticism. A person with evil intent could use it to hunt down sites that are easy to burgle. But Farmer is very concerned about the need to alert the public to poor security and, so far, events have proved him right. SATAN has done more to alert people to the risks than cause new disorder. So is the Net becoming more secure? Far from it. In the early days, when you visited a Web site your browser simply looked at the content. Now the Web is full of tiny programs that automatically download when you look at a Web page, and run on your own machine. These programs could, if their authors wished, do all kinds of nasty things to your computer. At the same time, the Net is increasingly populated with spiders, worms, agents and other types of automated beasts designed to penetrate the sites and seek out and classify information. All these make wonderful tools for antisocial people who want to invade weak sites and cause damage. But let"s look on the bright side. Given the lack of locks, the Internet is surely the world"s biggest (almost) crime-free society. Maybe that is because hackers are fundamentally honest. Or that there currently isn"t much to steal. Or because vandalism isn"t much fun unless you have a peculiar dislike for someone. Whatever the reason, let"s enjoy it while we can. But expect it all to change, and security to become the number one issue, when the most influential inhabitants of the Net are selling services they want to be paid for.

单选题Tuangou, also called team buying or group buying, is a recently developed shopping strategy starting in China. Several people connect over the Internet and agree to contact a seller of a specific product so that they can buy the same item as a group at a lower price. And the sellers benefit by selling many products at once. When people agree on group buying, individual members of the buying group can vouch for (替……担保) a particular seller"s quality to the rest of the group, therefore Tuangou helps change a traditional distrust of goods purchased from unknown sellers. Similar phenomena exist in Europe and North America. However, most of the group buying in these places is organized and done not by the team members themselves, but through online go-betweens.

单选题Energy will be one of the defining issues of this century. One thing is clear: the era of (1) Oil is over. What we all do next will determine how well we meet the energy needs of the entire world in this century and (2) .Demand is soaring like (3) before. As populations grow and economies (4) , millions in the developing world are enjoying the benefits of a lifestyle that (5) increasing amounts of energy. In fact, some say that in 20 years the world will (6) 40% more oil than it does today. At the same time, many of the world's oil and gas fields are (7) . And new energy discoveries are mainly occurring in places where resources are difficult to (8) , physically, economically and even politically. When growing demand meets (9) supplies, the result is more (10) for the same resources. We can wait until a crisis forces us to do something. (11) we can (12) to working together, and start by asking the (13) questions: How do we meet the energy needs of the developing world and those of industrialized nations? What role will renewables and (14) energies play? What is the best way to protect our environment? How do we accelerate our conservation efforts? (15) actions we take, we must look not just to next year, (16) to the next 50 years. At Chevron, we believe that innovation, collaboration and conservation are the (17) on which to build this new world. We cannot do this alone. Corporations, governments and every citizen of this planet must be part of the solution as (18) as they are part of the problem. We (19) scientists and educators, politicians and policy-makers, environmentalists, leaders of industry and each one of you to be part of (20) the next era of energy.

单选题This time tomorrow, I ________ on the beach, enjoying the sunshine!

单选题Throughout history man has had to accept the fact that all living things must die, but people now live longer than they (36) . Yet, all living things still show the (37) of aging, which will eventually. (38) death. Aging is not a disease, but as a person passes maturity, the cells of the body and the (39) they form do not function as well as they (40) in childhood and adolescence (青春期). The body provides less (41) against disease and is more prone (42) accident. A number of related cause may (43) aging. Some cells of the body have a fairly long life, but they are not (44) when they die. As a person ages, (45) of brain cells and muscle cells decrease, (46) body cells die and are replaced by new cells. In an aging person the (47) cells may not be as viable (能生存的) or as capable (48) growth as those of a young person. Another (49) in aging may be changes within the cells (50) . Some of the protein chemicals in cells are known (51) with age and become less elastic. This is why the skin of old people wrinkles and (52) . This is also the reason old people (53) in height. There may be other more important chemical changes in the cells. Some complex cell chemicals, such as RNA, store and (54) information that the cell need. Aging may affect this (55) and change the information carrying molecules so that they do not transmit the information as well.

单选题The phenomenon that Americans and British people pronounce some words differently can be interpreted in terms of______.

单选题The fire was the worst ______ ever to hit the town.

单选题The mason ______ I didn't do this exercise is I didn't know how to do it.

单选题 Sporting activities are essentially modified forms of hunting behavior. Viewed biologically, the modem foot-bailer is in reality a member of a hunting group. His killing weapon has turned into a harmless football and his prey (猎物) into a goalmouth. If his aim is accurate and he scores a goal, he enjoys the hunter's triumph of killing his prey. To understand how this transformation has taken place we must briefly look back at our forefathers. They spent over a million years evolving as cooperative hunters. Their very survival depended on success in the hunting-field. Under this pressure their whole way of life, even their bodies, became greatly changed. They became chasers, runners, jumpers, aimers, throwers and prey-killers. They cooperated as skillful male-group attackers. Then about ten thousand years ago, after this immensely long period of hunting their food, they became farmers. Their improved intelligence, so vital to their old hunting life, was put to a new use--that of controlling and domesticating their prey. The hunt became suddenly out of date. The food was there on the farms, awaiting their needs. The risks and uncertainties of the hunt were no longer essential for survival.

单选题Persons who are overweight should watch their diet carefully in order to lose pounds. The best way to do this is to start a weight control program. At first it is wise to talk with your doctor. He can advise you of the number of calories (卡路里) you should have in your meals each day. He can tell you about exercising while on your diet. A good rule is to lose slowly. A loss of a pound or two is plenty. Plan meals around foods you know. This means that it is wise to include foods that you are used to and that are part of your regular eating habits. When you have lost the weight you wish, simple items can be added to your diet so that you can maintain the weight you want. While you are dieting, try to build a pattern of eating that you can follow later to maintain your desired weight. When dieting, choose low-calorie foods. Avoid such items as fats, fried food, sweets, cakes, cream and soft drinks. Try to take coffee and tea without sugar or cream. Snacks can be part of your diet. For example, a piece of fruit or a simple dessert saved from mealtime can be eaten between meals. Keep busy! This way you will not be tempted to go off the diet. Make full use of opportunities to exercise. Try walking instead of riding whenever possible. Happy dieting!

单选题Speaker A: Could I trouble you to return these two books for me? Speaker B: ______ A. It's no trouble at all. B. Yes, please. C. Why didn't you go to the library yourself? D. Sure, I'll be glad to.

单选题The word "talking,(Line 5, Paragraph 3) denotes ______.

单选题Although dolphins sometimes swim singly or in pairs, they usually______in large herds, often numbering in the hundreds.

单选题Man: Bill looks very upset these days. What's happened to him recently? Woman: It seems that Bill could never shake off the feeling that he is a failure in his fife. Question: What does the woman mean?

单选题The official was arrested for inability to______ all his fortune he has enjoyed.(2004年武汉大学考博试题)

单选题 Fat: what is it good for? Absolutely nothing, or so you might think. But obesity seems to protect mice against a fatal form of malaria-cerebral malaria. Working out how it has this effect might lead to new treatments for people. Although obesity is now on the rise in the developing world, it has traditionally been seen as a malaise of the rich. In contrast, malaria tends to be regarded as a disease of the poor, so few people have studied how the two conditions affect each other. In mice meanwhile, there are signs that diabetes, which often affects obese people, might offer some protection against malaria. To find out more about how obesity affects malaria in mice, Vincent Robert at the Institute for Development Research (IRD) in Paris, France, and colleagues injected 14 obese and 14 non-obese mice with the malaria parasite Plasmodium berghei. After six days, eight of the non-obese mice died from cerebral malaria, which causes coma and death in humans, and the rest died about two weeks later from severe anemia because the parasite had destroyed their red blood cells. In contrast, none of the obese mice showed signs of cerebral malaria. Although they all eventually succumbed to severe anemia and died 18 to 25 days after infection, anemia can be treated-so obesity did seem to offer mice some useful protection. Exactly how the obese mice resist malaria is not clear, says Delphine Depoix from the Museum of Natural History in Paris, but there are several possibilities. One clue lies in a mutation in the gene coding for the leptin, a hormone produced by fat cells, which makes the mice obese, but also controls the immune response. Previous research has shown that obese mice with the leptin mutation often react to infections with a "Th2" rather than "Th1" response. As Th1 in mice is thought to trigger the inflammation that helps cerebral malaria to kill its victims, Depoix speculates that the Th2 response might be protecting the obese mice. Another possible explanation is that the abnormally high blood sugar associated with obesity in both mice and people "might compensate" for the low blood sugar caused by severe malaria, says Depoix, allowing the mice to better cope with parasite infection. Andrew Prentice of the London School of Hygiene and Tropical Medicine says that figuring out how the mice resist malaria will be crucial to developing new treatments for people with malaria. His colleague Christopher Whitty warns that any insights drawn from these results are preliminary: "Mouse models are always useful in raising hypotheses but cannot settle them as far as cerebral malaria is concerned."