单选题He is ill in bed, ______ we should take care of him.A. soB. butC. eitherD. nor

单选题If you were walking around a supermarket and saw a woman with a shaved head, a ring through her nose, a tattoo(文身)design on her arm and she has a small child in her shopping trolley , what would your opinion be? Do you think this kind of body decoration is attractive or ugly? Different people have different ideas. The following are some examples of body decoration from around the world. In many parts of Africa, it is thought that an attractive girl should have really shinny skin. On Bali, a little island in Indonesia, they believe that a beautiful woman or handsome man must have perfectly straight, flat teeth. The Balinese believe that teeth with pointed edges make you look like an ugly wild animal. So when a girl or boy becomes a teenager, he or she is taken to a special person in their village who will file off teeth points to make them smooth and flat. There is no anesthetic (麻药) and this tooth filing is really painful. It is a kind of test. If you can stand it without screaming or crying too much, then you are thought ready to become an adult. In Myanmar, there is a small group of people who are called the "Papaung". They believe that a woman can only be really beautiful if she has a long neck. I mean a VERY long neck. Now you might think that you are either born with a long or short neck and that there's nothing whatever you can do about it. But you would be wrong! At around the age of 5, a Papaung girl has heavy metal rings fitted around her neck, tightly between the chin and shoulders. Each year more rings are added and very, very slowly their weight pushes the shoulders down, in this way making the neck look longer. A Papaung woman will wear her neck rings all her life, never once taking them off. So now I'm sure you will all agree that different people have different ideas about what is beautiful.

单选题The word science is heard so often in modern times that almost everybody has some notion of its meaning. On the other hand, its definition is difficult for many people. The meaning of the term is confused, but everyone should understand its meaning and objectives. Just to make the explanation as simple as possible, suppose science is defined as classified knowledge (facts). Even in the true sciences distinguishing fact from fiction is not always easy. For this reason great care should be taken to distinguish between beliefs and truths. There is no danger as long as a clear difference is made between temporary and proved explanations. For example, hypotheses and theories are attempts to explain natural phenomena. From these positions the scientist continues to experiment and observe until they are proved or discredited. The exact statue of any explanation should be clearly labeled to avoid confusion. The objectives of science are primarily the discovery and the subsequent understanding of the unknown. Man cannot be satisfied with recognizing that secrets exist in nature or that questions are unanswerable; he must solve them. Toward that end specialists in the field of biology and related fields of interest are directing much of their time and energy. Actually, two basic approaches lead to the discovery of new information. One, aimed at satisfying curiosity, is referred to as pure science. The other is aimed at using knowledge for specific purposes—for instance, improving health, raising standards of living, or creating new consumer products. In this case knowledge is put to economic use. Such an approach is referred to as applied science. Sometimes practical-minded people miss the point of pure science in thinking only of its immediate application for economic rewards. Chemists responsible for many of the discoveries could hardly have anticipated that their findings would one day result in application of such a practical nature as those directly related to life and death. The discoveries of one bit of information opens the door to the discovery of another. Some discoveries seem so simple that one is amazed they were not made years ago; however, one should remember that the 'construction of the microscope had to precede the discovery of the cell. The host of scientists dedicating their lives to pure science are not apologetic about ignoring the practical side of their discoveries; they know from experience that most knowledge is eventually applied.

单选题[z]is a voiceless, alveolar fricative consonant while[j]is a palatal approximant.

单选题______evidence indicates that acid rain is damaging historic sites in many parts of this developing country.

单选题The author gives a detailed explanation of the examples of the Asian engineer and the Japanese manager to show

单选题{{B}}(4){{/B}} It is not unusual for chief executives to collect millions of dollars a year in pay, stock options, and bonuses. In the last fifteen years, while executive remuneration rose, taxes in the highest income bosses went down. Millionaires are now commonplace. Amiability is not a prerequisite for rising to the top, and there are a number of chief executive officers with legendary bad tempers. It is not the boss' job to worry about the well-being of his subordinates although the man with many enemies will be swept out more quickly in hard times; it is the company he worries about. His business savvy is supposed to be based on intimate knowledge of his company and the industry so he goes home nightly with a full briefcase. At the very top—and on the way up—executives are exceedingly dedicated. The American executive must be capable of enough small talk to get him through the social part of his schedule, but he is probably not a highly cultured individual or an intellectual. Although his wife may be on the board of the symphony or opera, he himself has little time for such pursuits. His reading may largely concern business and management, despite interests in other fields. Golf provides him with a sportive outlet that combines with some useful socializing. These days, he probably attempts some form of aerobic exercise to "keep the old heart in shape" and for the same reason goes easy on butter and alcohol, and substances thought to contribute to taking highly stressed executives out of the running. But his doctor's admonition to "take it easy" falls on deaf ears. He likes to work. He knows there are younger men nipping at his heels. Corporate head-hunting, carried on by "executive search firms", is a growing industry. America has great faith in individual talent, and dynamic and aggressive executives are so in demand that companies regularly mid each other's managerial ranks.

单选题—What' s the result of the basketball match? —You see, the rain______it and the second half is put off till next PE class.

单选题Mr. Holmes called at many schools ______ he lived to ask them to accept his son, but he was refused everywhere for being a black.A. thatB. around whereC. near whichD. which

单选题Having decided to rent a flat, we ______ contacting all the accomodation agencies in the city.

单选题It shows how economic and social and, above all, political changes have played their part, so that, correctly ______, the postage stamp in which millions of people, young and old, find pleasure, knowledge and even profit, has always been a faithful mirror of the times. A. interpreting B. interpreted C. to be interpreted D. being interpreted

单选题Being wronged, the little girl tried to______her tears at first, but on seeing her mother, she burst out crying.

单选题Cyclo-cross is a cross-country bicycle racing in open and usually quite rough country with riders often forced to dismount and carry their bicycles. The sport, originated early in the 20th century in France, was prevalent in the 1920s, but became prominent in the 1950s (the British Cyclo-Cross Association was founded in 1954). An original European sport, cyclo-cross became popular throughout Western Europe and in the United States. World championships were initiated in 1925; by 1950 these were recognized by the Union Cyclist International(International Cyclists' Union). After 1967 amateur and professional classes were officially separated in competition. The 24-kilometer cyclo-cross course, often involving taps, is usually completed in 60 minutes. A course typically includes obstacles such as ditches, mud, fallen trees, streams, flight of stairs, fences, and gates; artificial hurdles are added to insufficiently challenging natural courses. Cyclo-cross races are usually held from September to March, adding winter weather hazards to the challenge . There is a massed start with the field assembling not more than two abreast. Helpers are often stationed around the course with spare bicycles in case the original machine encounters mechanical difficulties or becomes too weighted down by mud picked up to the course.

单选题The teacher's name is Mary Joan Shut. Her students call her ______.

单选题The only solution to rubbish problem for a nation which now spends more on wrapping food than it pays farmers to produce it, is recovering ______ the packaging materials for commercial as well as for conservation reasons. A. on sale B. on the spot C. on a large scale D. on all sides

单选题Working memory, or short-term memory, involves the ability to hold and use information in the immediate future. 21 is only held in working memory for about 20 seconds. The challenge that students 22 is to move information from their working memories into their long-term memories. If they don"t do this in about the first few minutes after receiving the information, that information can be lost. To keep this newly learned material from 23 away, it needs to enter the network of the brain"s wiring. After repeated practice, working memories are set down as permanent neuronal (神经的) circuits 24 to be activated (激活) when the information is needed. When a memory has been recalled 25 its neuronal circuits are more highly developed because of their repeated activation. 26 exercising a muscle, these circuits then become more efficient and easier to access and activate. Practice results 27 repeated stimulation of the memory circuit. Like hikers along a path 28 eventually leave a depression in the road, repeated practice stimulates cells in the memory circuit such that the circuit is reinforced and becomes 29 . This means it can be quickly turned from off to on, and switched 30 through a variety of cues coming in from the senses.

单选题Have you ever been startled by a loud noise or by someone appearing suddenly behind you on dark night or by a snake in the grass? Do you remember the sudden, tight feeling in your chest, the way your heart started go pound, the way you seemed to breathe more rapidly? Such reactions occurred because you were frightened. Your brain sent a signal to the special gland (腺) in your body caned the adrenal (肾上的) gland. Other parts of your body were involved, too, but the adrenal gland has a very special function. The adrenal gland is located on top of your kidney. Since you have two kidneys. You also have two adrenal glands. Each adrenal gland is divided into two parts: a cortex (外皮) and a medulla (髓质). The cortex forms the outer shell; the medulla forms the central core. Both the cortex and the medulla secrete (分泌) hormones, but they have different functions. The cortex produces more than forty different chemical compounds and hormones. All these things are essential to sustain life. The medulla secretes adrenalin (also called epinephrine, the hormone that prepares the body for emergencies.) When you are suddenly faced with a dangerous or stressful situation, part of your brain instantly sends a signal to the adrenal gland, and all sorts of things begin to your body. The medulla releases an extra amount of adrenalin into the bloodstream. The adrenalin is carried rapidly throughout the body, stimulating other glands and systems.

单选题We all know that it is possible for ordinary people to make their homes on the equator (赤道), although often they may feel uncomfortably hot there. Millions do it. But as for the North Pole (北极)--we know that it is not only a dangerously cold place, but that people like you and me would find it quite impossible to live there. At the present time only the scientists and explorers can do so, and they use special equipment. Men had been traveling across and around the equator on wheels, on their feet or in ships for thousands of years; but only a few men, with great difficulty and in very recent time, have ever crossed the ice to the North Pole. So it may surprise you to learn that, when traveling by air, it is really safer to fly over the North Pole than over the equator. Of course, this is not true about landings in the polar region (which passenger aeroplanes do not make), but the weather, if we are flying at a height of 5000 meters above the Pole, is a delight. At 4 000 meters and More above the earth you can always be sure that you will not see a cloud in the sky as far as the eye can reach. In the tropics (热带), on the other hand, you are not certain to keep clear of bad weather even at such heights as 18 000 or 20 000 meters. Aeroplanes can't climb as high or as quickly in cold air as in warm air. Nor can clouds. In practice, this is an advantage to the aeroplane, which is already at a good height when it reaches the polar region and so does not need to climb, while at the same time cold air keeps the clouds down low.