单选题The gravitational pull of the Earth and the Moon is important to us as we attempt to conquer more and more of outer-space. Here's why. As a rocket leaves the Earth, the pull of the Earth on it becomes less and less as the rocket roars out into space. If you imagine a line between the Earth and the Moon, there is a point somewhere along that line, nearer to the Moon than to the Earth, at which the gravitation pull of both the Earth and the Moon on an object is just about equal. An object placed on the Moon side of that point would be drawn to the Moon. An object placed on the Earth side of that point would be drawn to the Earth. Therefore, a rocket need be sent only to this "point of no return" in order to get it to the Moon. The Moon's gravity will pull it the rest of the way. The return trip of the rocket to the Earth is, in some ways, less of a problem. The Earth's gravitational field reaches far closer to the Moon than does the Moon's to the Earth. Thus it will be necessary to fire an Earthbound rocket only a few thousand miles away from the Moon to reach a point where the rocket will drift to the Earth under the Earth's gravitational pull. The problem of rocket travel is not so much concerned with getting the rocket into space as it is with guiding the rocket after it leaves the Earth's surface. Remember that the Moon is constantly circling the Earth. A rocket fired at the Moon and continuing in the direction in which it was fired would miss the Moon by a wide margin and perhaps continue to drift out into space until "captured" in another planet's gravitational field. To reach the Moon, a rocket must be fired toward the point where the Moon will be when the rocket has traveled the required distance. This requires precise calculations of the speed and direction of the rocket and of the speed and direction of the Moon. For a rocket to arrive at a point where the Moon's gravity will pull it the rest of the way, it must reach a speed called velocity of escape. This speed is about 25,000 miles per hour. At a speed less than this, a rocket will merely circle the Earth in an orbit and eventually fall back to the Earth.

单选题These newly unearthed cultural relics on the origin of Chinese characters ______ the intelligence of our remote ancestors.

单选题My task boils down to industrial ______ and trouble shooting.

单选题The workers in that factory manufacture furniture.

单选题They have made a ______ plan to build a suspension bridge over the river.

单选题Woman: Don't you think this candle light dinner is romantic? Man: Sure, at least I don't have to look at the food. Question: What does the man think of the food?

单选题Architects are hopeless when it comes to deciding whether the public will view their designs as marvels or monstrosities, according to a study by Canadian psychologists. They say designers should go back to school to learn about ordinary people's tastes. Many buildings that appeal to architects get the thumbs down from the public. Robert Gifford of the University of Victoria in British Columbia decided to find out whether architects understand public preferences and simply disagree with them, or fail to understand the lay person's view. With his colleague Graham Brown, he asked 25 experienced architects to look at photos of 42 large buildings in the US, Canada, Europe and Hong Kong. The architects predicted how the public would rate the buildings on a scale of 1 to 10, where 1 represented "terrible” and 10"excellent". A further 27 people who were not architects also scored the buildings out of 10. In addition, eight architects gave their own personal ratings of the buildings. The three groups tended to agree among themselves on a building's merits. And architects correctly predicted that lay people would on average rate buildings higher than they did themselves. But for individual buildings, the architects' perceptions of what the lay people would think were often way off the mark. "Some architects are quite good at predicting lay preferences, but others are not only poor at it, they get it backwards,” says Gilford. For instance, architects gave the Stockley Park Building B-3 offices in London a moderate rating of 5.2. They thought the public would like it much better, predicting a rating of 6.3. But the public actually disliked the offices, and gave it 4.7. Gifford thinks that lay people respond to specific features of buildings, such as durability and originality, and hopes to pin down what they are. "Architects in architecture school need to be taught how lay people think about buildings," Gifford concludes. He doesn't think designers should pander to the lowest common denominator, but suggests they should aspire towards buildings that appeal to the public and architects alike, such as the Bank of China building in Hong Kong. Marco Goldschmeid of the Richard Rogers Partnership, designers of the Millennium Dome in London, thinks the study is flawed. "The authors have assumed, wrongly, that buildings can be meaningfully judged from photographs rather than actual visits," he says. Goldschmeid thinks it would be more significant and interesting to look at the divergence of public taste between generations.

单选题Man: What's your husband's idea for the vacation? Woman: Well, my husband is a real outdoor man. He just cannot wait to get out of the city. He likes fishing, boating and'bird-watching. He thinks sleeping in a tent beside a lake is great. Question: What does the woman's husband want to do?

单选题The government's attempt to Uinhibit/U the present speed of inflation is highly appreciated.

单选题Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries. Yet much had happened (61) As was discussed before, it was not (62) the 19th century that the newspaper became the dominant pre-electronic (63) , following in the wake of the pamphlet and the book and in the (64) of the periodical. It was during the same time that the communications revolution (65) up, beginning with transport, the railway, and leading (66) through the telegraph, the telephone, radio, and motion pictures (67) the 20th-century world of the motor car and the air plane. Not everyone sees that process in (68) . It is important to do so. It is generally recognized, (69) , that the introduction of the computer in the early 20th century, (70) by the invention of the integrated circuit during the 1960s, radically changed the process, (71) its impact on the media was not immediately (72) . As time went by, computers became smaller and more powerful, and they became "personal" too, as well as (73) , with display becoming sharper and storage (74) increasing. They were thought of, like people, (75) generations, with the distance between generations much smaller. It was within the computer age that the term "information society" began to be widely used to describe the context within which we now live.

单选题Wan: What kind of snacks do you prefer? Woman: Oh, I've got a sweet tooth, you know. Question: What does the woman probably like?

单选题Starting as a ______campus movement, initially observed on March 21, Earth Day has become a major educational and media event.

单选题Jim did not like our plan; so he countered it with one of his own.

单选题One expert (remarks) that a computer with (so) many tubes as the brain (has) neurons (would require) the Empire State Building to contain it.

单选题The electronic computer is ______some of the tasks that were once accomplished by our own brains.

单选题Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone (61) making mistakes. It is actually caused by (62) of your "body clock"—a small cluster of brain cells that controls the timing of biological (63) The body clock is designed for a (64) rhythm of daylight and darkness, so that it is thrown out of balance when it (65) daylight and darkness at the "wrong" times in a new time zone. The (66) of jetlag of ten persist for days (67) the internal body clock slowly adjusts to the new time zone. Now a new anti-jetlag system is (68) that is based on proven (69) pioneering scientific research. Dr. Martin Mooreede had (70) a practical strategy to adjust the body clock much sooner to the new time zone (71) controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates (72) of the discomfort of jetlag. A successful time zone shift depends on knowing the exact times to either (73) or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule (74) light exposure depends a great deal on (75) travel plans.

单选题Nothing is so uncertain as the fashion market where one style ______ over another before being replaced.

单选题{{B}}Passage Two{{/B}} Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food. Fergus Clydesdale, head of the department of food science and nutrition at the University of Massachusetts-Amherst, says bluntly that if the dangers from bacterially contaminated chicken were as great as some people believe, "the streets would be littered with people lying here and there." Though the public increasingly demands no-risk food, there is no such thing. Bruce Ames, chairman of the biochemistry department at the University of California, Berkeley, points out that up to 10% of a plant's weight is made up of natural pesticide (杀虫剂). Says he. "Since plants do not have jaws or teeth to protect themselves, they employ chemical warfare." And many naturally produced chemicals, though occurring in tiny amounts, prove in laboratory tests to be strong carcinogens--a substance that can cause cancer. Mushrooms (蘑菇) might be banned if they were judged by the same standards that apply to food additives (添加剂). Declares Christina Stark, a nutritionist at Cornell University: "We've got far worse natural chemicals in the food supply than anything man-made. Yet the issues are not that simple. While Americans have no reason to be terrified to sit down at the dinner table, they have every reason to demand significant improvements in food and water safety. They unconsciously and unwillingly take in too much of too many dangerous chemicals. If food already contains natural carcinogens, it does not make much sense to add dozens of new man-made ones. Though most people will withstand the small amounts of contaminants generally found in food and water, at least a few individuals will probably get cancer one day because of what they eat and drink. To make good food and water supplies even better, the Government needs to tighten its regulatory standards, stiffen its inspection program and strengthen its enforcement policies. The food industry should modify some long-accepted practices or turn to less hazardous alternatives. Perhaps most important, consumers will have to do a better job of learning how to select and cook food properly. The problems that need to be tackled exist all along the food-supply chain, from fields to processing plants to kitchens.

单选题A: That was an absolutely delicious meal.B: ______

单选题A: I can't remember what time the movie starts. B: ______.