单选题 How many things can you see in the night sky? A lot! On a clear night you might see the Moon, some planets, and thousands of sparkling stars. You can see even more with a telescope. You might see stars where before you only saw dark space. You might see that many stars look larger than others. You might see that some stars that look white are really red or blue. With bigger and bigger telescopes you can see more and more objects in the sky. And you can see those objects in more and more details. But scientists believe there are some things in the sky that we will never see. We won't see them with the biggest telescope in the world, on the clearest night of the year. That's because they're Invisible. They're the mysterious dead stars called black holes. You might find it hard to imagine that stars die. After all, our Sun is a star. Year after year we see it up in the sky burning brightly, giving us heat and light. The Sun certainly doesn't seem to be getting old or weak. But stars do burn out and die after billions of years. As a star's gases burn, they give off light and heat. But when the gas runs out, the star stops burning and begins to die. As the star cools, the outer layers of the star pull in toward the center. The star squashes into a smaller and smaller ball. If the star was very small, the star ends up as a cold. dark ball called a black dwarf. If the star was very big, it keeps squashing inward until it's packed together tighter than anything in the universe. Imagine if the each were crushed until it was the size of a tiny marble. That's how tightly this dead star, a black hole is packed. What pulls the star in toward its center with such power?. It's the same force that pulls you down when you jump--the force called gravity. A black hole is so tightly packed that its gravity sucks in everything--even light. The light from black hole can never come back to your eyes. That's why you see nothing but blackness. So the next time you stare up at the night sky, remember: there's more in the sky than meets the eyes! Scattered in the silent darkness are black holes--the great mystery of space.

单选题The figure above represents a window, with the shaded regions representing openings for glass and the pale regions representing the wood panels between and around the glass. If the window is 4.5 feet high by 2.5 feet wide, and if each of the wooden panels is exactly 4 inches thick, what is the total surface area, in square inches, of glass in the window? (1 foot=12 inches; figure not drawn to scale) A. 189 B. 378 C. 448 D. 756 E. 1,620

单选题Do you know the fact that broad bean contain ______ that must be destroyed by cooking them at high temperature before eating them? A.flake B.aroma C.ether D.toxin

单选题In ancient times the {{U}}custom{{/U}} of shaking hands served to transfer power or authority.

单选题{{B}}Passage Three{{/B}} When I was a child in Sunday school, I would ask searching questions like "Angels can fly up in heaven, but how do clouds hold up pianos, and get the same puzzling response about how that was not important, what was important was that Jesus died for our sins and if we accepted him as our savior, when we died, we would go to heaven, where we'd get everything we wanted. Some children in my class wondered why anyone would hang on a cross with nails stuck through his hands to help anyone else; I wondered how Santa Claus knew what I wanted for Christmas, even though I never wrote him a letter. Maybe he had a tape recorder hidden in every chimney in the world. This literal-mindedness has stuck with me; one result of it is that I am unable to believe in God. Most of the other atheists I know seem to feel freed or proud of their unbelief, as if they have cleverly refused to be sold snake oil. My husband, who was reared in a devout Catholic family, has served as an altar boy. So other than baptizing our son to reassure our families, we've skated over the issue of faith. Some people believe faith is a gift; it's a choice, a matter of spiritual discipline. I have a friend who was reared to believe, and he does. But his faith has wavered. He has struggled to hang onto it and to pass it along to his children. Another friend of mine never goes to church because she's a single mother who doesn't have the gas money. But she once told me a day when she was washing oranges as the sun streamed onto them. As she peeled one, the smell rose to her face, and she felt she received the Holy Spirit. "He sank into my bones," she recounted. "I lifted my palms upward, feeling filled with love. " Being no theologian, and not even a believer, I am not in a position to offer up theories, but mine is this: people who receive faith directly, as a spontaneous combustion of the soul, have fewer questions. They have been sparked with a faith that is more unshakable than that of those who have been taught.

单选题"Employees have the responsibility to say here's what I want, here's what I need, here's what would make me stay." Says author and {{U}}consultant{{/U}} Beverly Kaye.

单选题In the novels of Hawthorne and Melville, one will find

单选题We sometimes hear that essays are an old-fashioned form, that so-and-so is the "last essayist", but the facts of the marketplace argue quite otherwise. Essays of nearly any kind are so much easier than short stories for a writer to sell, so many more see print, it's strange that though two fine anthologies (collections) remain that publish the year's best stories, no comparable collection exists for essays. Such changes in the reading public's taste aren't always to the good, needless to say. The art of telling stories predated even cave painting, surely; and if we ever find ourselves living in caves again, it (with painting and drumming) will be the only art left, after movies, novels, photography, essays, biography, and all the rest have gone down the drain--the art to build from. Essays, however, hang somewhere on a line between two sturdy poles: this is what I think, and this is what I am. Autobiographies which aren't novels are generally extended essays, indeed. A personal essay is like the human voice talking, its order being the mind's natural flow, instead of a systematized outline of ideas. Though more changeable or informal than an article or treatise, somewhere it contains a point which is its real center, even if the point couldn't be uttered in fewer words than the essayist has used. Essays don't usually boil down to a summary, as articles do, and the style of the writer has a "nap" to it, a combination of personality and originality and energetic loose ends that stand up like the nap (绒毛) on a piece of wool and can't be brushed flat. Essays belong to the animal kingdom, with a surface that generates sparks, like a coat of fur, compared with the flat, conventional cotton of the magazine article writer, who works in the vegetable kingdom, instead. But, essays, on the other hand, may have fewer "levels" than fiction, because we are not supposed to argue much about their meaning. In the old distinction between teaching and storytelling, the essayist, however cleverly he tries to conceal his intentions, is a bit of a teacher or reformer, and an essay is intended to convey the same point to each of us. An essayist doesn't have to tell the whole truth and nothing but the truth, he can shape or shave his memories, as long as the purpose is served of explaining a truthful point. A personal essay frequently is not autobiographical at all, but what it does keep in common with autobiography is that, through its tone and tumbling progression, it conveys the quality of the author's mind. Nothing gets in the way. Because essays are directly concerned with the mind and the mind's peculiarity, the very freedom the mind possesses is conferred on this branch of literature that does honor to it, and the fascination of the mind is the fascination of the essay.

单选题Learning a language is not for everyone. Some people find it very difficult and stressful; others actually enjoy the mental challenge and still others(although these are rare people)find it easy to learn a foreign language. Recently, there has been a lot of interest in trying to define the characteristics of a " good" language learner. Here are four examples—can you select the person who is likely to make the best language learner from these descriptions of their needs and personalities? Perhaps it is best to take a typical example at the outset. Fred Brown had to retire last year because of a bad heart. He went to Spain for a holiday and decided he liked the country and the people so much that he would like to learn the language. He already speaks good French and a little Italian and he thinks these will give him a head start in learning another Latin language. He sees language leaning as a detective game; He hunts for cines and likes to find the answers himself. He knows that language learning is hard work, but he gives himself a little to learn each day. He listens to himself and usually knows when he has made a mistake. He knows exactly what sort of Spanish he wants to learn and is only interested in that. Mary Green has friends in Athens and she has been to Greece several times. Through her friends she met a Greek working in London and now they are engaged to be married. They plan to live in London but she feels she must learn Greek to talk to her future in-laws. She is going to Greek cookery classes as well. She says she is "hopeless at languages" and she hated the French teacher at school. She thinks language is all about talking and she tries to experiment with the language she knows:She takes risks. She is rather lazy about reading Greek and "switches off" when she sees it written down. She finds the classes a bit boring because she is not learning the things she wants to leam but she has not spoken to the teacher about this. In total contrast to someone who has the need to integrate into a family situation, however, is John Freeman. John"s company is starting to sell sportswear in France next May and John will have to visit Marseilles four times a year. There will be a local agent so he will not have to negotiate in French. He has been to France on holiday three times and knows a few words already. He enjoyed the sunshine but doesn"t really like foreigners:" They"re all a funny lot. " He is a very precise person who always likes to be accurate and doesn"t like to make a fool of himself. He does not speak any other languages and is motivated to learn French because of his work. He knows that language can be described as a series of rules and he tries hard to learn the system. He likes the teacher to translate so that he can be sure he has understood exactly what every word means. He is not interested in wasting his time guessing. He has not thought about what kind of French he needs to learn. Jane Smith, on the other hand, hasn"t even started work so she won"t have the strong motivation that working in a language gives people who are trying to sell their products. However, she doesn"t think that foreigners are strange people and she isn"t frightened of making mistakes because " it"s all a bit of fun". She has now finished her first school examinations and, although she is going on to study science in the 6th Form, she doesn"t want to forget the German she has studied. She can"t bear writing, though, and is impatient with herself when she makes grammatical mistakes. She doesn"t really know why she is continuing to leam and she has already said that if her German studies take up too much of her time, she will drop them and focus on "real" work. All of these learners have their own reasons and they are all different in how they approach the task and what they think learning is all about. The experts" view is that people who have a clear idea of the reasons for learning will do well and, on that basis, Fred Brown, John Freeman and Mary Green are clearly advantaged. However, it is also true that those who take risks and experiment do well and regular exposure to the language do well and here, of courses, John and Mary may have the edge over people like Jane. There"s also a case to be made that for those who enjoy learning and don"t care too much about making mistakes, success can come easily.

单选题I saw a television advertisement recently for a new product called an air sanitizer. A woman stood in her kitchen, spraying the empty space in front of her as though using Mace against an imaginary assailant. She appeared very determined. Where others are satisfied with antibacterial-laced sponges, dish soaps, hand sanitizers and telephone wipes, here was a woman who sought to sterilize the air itself. As a casual student of microbiology, I find it hard to escape the absurdity here. This woman is, like any human being, home to hundreds of trillions of bacteria. Bacteria make up a solid third, by weight, of the contents of her intestines. If you were to sneak into her bathroom while she was showering—and based on my general impression of this woman from the advertisement, I don't recommend this—and secret away a teaspoon of the water at her feet, you would find some 820 billion bacteria. Bacteria are unavoidably, inevitably—and, usually, utterly benignly—a part of our world. The fantasy of a germ-free home is not only absurd, but it is also largely pointless. Unless you share your home with someone very old, very young (under 6 months) or very ill, the few hundred bacteria on a countertop, doorknob or spoon pose no threat. The bacteria that cause food poisoning, the only significant rational bacterial worry in the average home, need to multiply into the thousands or millions before they can overwhelm your immune system and cause symptoms. The only way common food poisoning bacteria can manage this is to spend four or five hours reproducing at room temperature in something moist that you then eat. If you are worried about food poisoning, the best defense is the refrigerator. If you don't make a habit of eating perishable food that has been left out too long, don't worry about bacteria. Viruses are slightly different. You need only pick up a few virus particles to infect yourself with a cold or flu, and virus particles can survive on surfaces for days. So disinfecting the surfaces in the home should, in theory, reduce the chances of picking up a bug. In practice, the issue is less clear. A study by Dr. Elaine Larson at the Columbia School of Nursing called into question the usefulness of antibacterial products for the home. In New York, 224 households, each with at least one preschooler, were randomly assigned to two groups. One group used antibacterial cleaning, laundry and hand-washing products. The other used ordinary products. For 48 weeks, the groups were monitored for seven symptoms of colds, flu and food poisoning—and found to be essentially the same. According to Dr. Gerba' s research, an active adult touches an average of 300 surfaces every 30 minutes. You cannot win at this, You will become obsessive-compulsive. Just wash your hands with soap and water a few times a day, and leave it at that.

单选题Maggie ran back to the kitchen, ______ carefully in her hands. A. eggs to be held B. holding the eggs C. eggs were held D. held the eggs

单选题A: Have you a single room with bath for tonight and tomorrow night?B: ______. A. Yes. The rooms have been sold out. B. No. Just a moment, please. C. Yes, our rooms are very good. D. Sorry, we haven't any singles left, I'm afraid.

单选题When traveling, you are advised to take traveler's checks, which provide a secure ______ to carrying your money in cash.(2010年厦门大学考博试题)

单选题I'll lend you my cassette recorder ______ I've done with it.

单选题 Watch a baby between six and nine months old, and you will observe the basic concepts of geometry being learned. Once the baby has mastered the idea that space is three-dimensional, it reaches out and begins grasping various kinds of objects. It is then, from perhaps nine to fifteen months, that the concepts of sets and numbers are formed. So far, so good. But now an ominous development takes place. The nerve fibers in the brain insulate themselves in such a way that the baby begins to hear sounds very precisely. Soon it picks up language, and it is then brought into direct communication with adults. From this point on, it is usually downhill all the way for mathematics, because the child now becomes exposed to all the nonsense words and beliefs of the community into which it has been so unfortunate as to have been born. Nature, having done very well by the child to this point, having permitted it the luxury of thinking for itself for eighteen months, now abandons it to the arbitrary conventions and beliefs of society. But at least the child knows something of geometry and numbers, and it will always retain some memory of the early halcyon days, no matter what vicissitudes it may suffer later on. The main reservoir of mathematical talent in any society is thus possessed by children who are about two years old, children who have just learned to speak fluently.

单选题The phrase "smoking gun" in the first paragraph probably means

单选题The Hocanes A appear B friendly and peaceful , C but they are deeply suspicious of D another tribes.