单选题The subject of this passage is the _______.

单选题A panel of prominent marine mammalogists will be Uassembled/U to study Keiko's behavior.

单选题Superconductor Ceramic (陶瓷) An underground revolution begins this winter. With the flip (轻击) of a switch,30,000 homes in one part of Detroit will soon become the first in the country to receive electricity transmitted by ice-cold high-performance cables. Other American cities are expected to follow Detroit"s example in the years ahead, which could conserve enormous amounts of power. The new electrical cables at the Frisbie power station in Detroit are revolutionary because they are made of superconductors. A superconductor is a material that transmits electricity with little or no resistance. Resistance is the degree to which a substance resists electric current. All common electrical conductors have a certain amount of electrical resistance. They convert at least some of the electrical energy passing through them into waste heat. Superconductors don"t. No one understands how superconductivity works. It just does. Making superconductors isn"t easy. A superconductor material has to be cooled to an extremely low temperature to lose its resistance. The first superconductors, made more than 50 years ago, had to be cooled to -263 degrees Celsius before they lost their resistance. Newer superconducting materials lose their resistance at -143 degrees Celsius. The superconductors cable installed at the Frisbie station is made of a ceramic material that contains copper, oxygen, bismuth (铋), strontium (锶), and calcium (钙). A ceramic is a hard, strong compound made from clay or minerals. The superconducting ceramic has been fashioned into a tape that is wrapped lengthwise around a long tube filled with liquid nitrogen. Liquid nitrogen is super cold and lowers the temperature of the ceramic tape to the point where it conveys electricity with zero resistance. The United States loses an enormous amount of electricity each year to resistance. Because cooled superconductors have no resistance, they waste much less power, other cities are watching the Frisbie experiment in the hope that they might switch to superconducting cable and conserve power, too.

单选题I don't get into a panic speaking the language when I'm in Greece, it's driving on the other side of the road which bothers me. A. anxiety B. objection to C. trouble in D. dismay

单选题Techniques to {{U}}employ{{/U}} the energy of the sun are being developed. A.convert B.store C.use D.receive

单选题American Society When foreigners are sometimes asked what seems most strange about American society, somewhere on the top of the list will be the fact the average citizen is allowed to possess guns. Although it is true that many people carry guns legally in the United States, it is also known that many who possess guns carry illegally. Others, who don't have guns, feel that guns can be acquired quite easily. A recent survey indicated that many high school students, especially in the inner cities, can acquire gun with little difficulty. Although most people would never want to own a gun, others have taken up hunting as a sport and enjoy hunting wild game in season. Hunting for deer and duck in fall and winter is very much a part of the American culture. Also, some farmers in rural areas who raise cattle and sheep feel they need to protect their animals against wolves that attack their herds and flocks at night. To defend and support their rights to possess firearms the National Rifle Association (NRA) was founded in 1871. The main importance of this organization has been its efforts to prevent strict gun control legislation. The NRA has great political support in small towns and rural areas, especially in the West and the South, where hunting is especially popular. Those who favor the right to possess guns insist that the Constitution provides the right of people "to keep and bear arms". They believe that gun control laws will not solve the problem of crime and violence in America. Recent events in America, however, have shown that the question of gun possession is now out of control and strong voices have called for immediate action to be taken. In seemingly peaceful schools students have gone into classrooms and opened fire upon their classmates. America has been shocked by such incidents which seem to occur with greater frequency. The periodic deaths of innocent citizens and even foreign visitors from guns have forced legislators to pass laws to stop these senseless killings. The day may not be far off when America will be transformed from a gun culture to one which controls their use and possession.

单选题This gold mine was discovered {{U}}by accident{{/U}}.

单选题 阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子做出判断。如果该句提供的是正确信息，请选A；如果该句提供的是错误信息，请选 B；如果该句的信息文章中没有提及，请选C。 {{B}} A Dolphin and an Astronomer{{/B}} One day in 1963, a dolphin named Elvar and a famous astronomer, Carl Sagan, were playing a little game. The astronomer was visiting an institute which was looking into the way dolphins communicate with each other. Sagan was standing on the edge of one of the tanks where several of these friendly, highly intelligent creatures were kept. Elvar had just swum up alongside him and had turned on his back. The dolphin wanted Sagan to scratch his. stomach again, as the astronomer had done twice before. Elvar looked up at Sagan, waiting. Then, after a minute or so, the dolphin leapt up through the water and made a sound just like the word "more". The astonished astronomer went to the director of the institute and told him about the incident. "Oh, yes. That's one of the words he knows," the director said, showing no surprise at all. Dolphins have bigger brains in proportion to their body size than humans have, and it has been known for a long time that they can make a number of sounds, What is more, these sounds seem to have different functions, such as warning each other of danger. Sound travels much faster and much further in water than it does in air, That is why the parts of the brain that deal with sound are much better developed in dolphins than in humans. But can it be said that dolphins have a "language", in the real sense of the word? Scientists don't agree on this. A language is not just a collection of sounds, or even words. A language has a structure and what we call a grammar. The structure and grammar of a language help to give it meaning. For example, the two questions "Who loves Mary?" and "Who does Mary love?" mean very different things. If you stop to think about it, you will see that this difference doesn't come from the words in the question but from the difference in structure. That is why the question "Can dolphins speak?" can't be answered until we find out if dolphins not only make sounds but also arrange them in a grammatical order which affects their meaning.

单选题The tomato juice left a brown stain on the front of my jacket.

单选题An old friend called on me the day before yesterday.

单选题In Tom's eyes, the restaurant at the comer of the street is a very smart one.A. cleverB. elegantC. loyalD. brave

单选题The people of Kiribati worry that one day their country will be taken away by a sudden high tide.

单选题There is no risk to public health.

单选题It is postulated that a cure for the disease will have been found by the year 2000.

单选题Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.

单选题Vibrating Rubber Cellphones Vibrating rubber cellphones could be the next big thing in mobile communications. They allow people to press the phone to transmit vibrations along with their 16 words. According to a research team at the MIT Media Lab in Cambridge, Massachusetts, the idea will make 17 more fun. Many mobile phones can already vibrate instead of ringing 18 you do not want people to know you are getting a call. But these 19 are too simple for subtle (敏感的) communication, 20 Angela Chang of the lab"s Tangible Media Group. "They"re either on or off," she says. But when you hold Chang"s rubber cellphone, your fingers and thumb wrap around five 21 speakers. They vibrate 22 your skin around 250 times per second. Beneath these speakers sit pressure sensors (传感器), so you can transmit vibration as well as 23 it. When you squeeze with a finger, a vibration signal is transmitted 24 your caller"s corresponding finger, its speed 25 on how hard you squeeze. Chang says that within a few minutes of being given the phones, students were using the vibration feature to 26 emphasis to what they were saying. Over time, people even began to transmit their own kind of ad hoe (特别的) "Morse code", which they would repeat back to show they were 27 what the other person was saying. Chang thinks "vibralanguages" could function for the same 28 as texting: sometimes people want to communicate 29 without everyone nearby knowing what they"re saying. "And 30 actually being able to shake someone"s hand when you close a business deal," she says.

单选题More Than a Ride to School The National Education Association claims. "The school bus is a mirror of the community." They further add that, unfortunately, what appears on the exterior does not always reflect the reality of a chosen community. They are right, sometimes it reflects more! Just ask Liesl Denson. Riding the school bus has been more than a ride to school for Liesl. Bruce Hardy school bus driver for Althouse BUS Company has been Liesl's bus driver since kindergarten. Last year when Liesl's family moved to Parkesburg, knowing her bus went by her new residence, she requested to ride the same bus. This year Liesl is a senior and will enjoy her last year riding the bus. She says, "It's been a great ride so far! My bus driver is so cool and has always been a good friend and a good listener. Sometimes when you're a child adults do not think that what you have to say is important. Mr. Hardy always listens to what you have to say and makes you feel important. " Her friends Ashley Batista and Amanda Wolfe agree. Bruce Hardy has been making Octorara students feel special since 1975. This year he will celebrate 30 years working for Althouse Bus Company, Larry Althouse, president of the company, acknowledges Bruce Hardy's outstanding record: "You do not come by employees like Bruce these days. He has never missed a day of work and has a perfect driving record. He was recognized in 2000 by the Pennsylvania School Bus Association for driving 350,000 accident free miles. Hardy's reputation is made further evident through the relationships he has made with the students that ride his bus." Althouse further adds, "Althouse Bus Company was established 70 years ago and has been providing quality transportation ever since. My grandfather started the business with one bus. Althouse Bus Company is delighted to have the opportunity to bring distinctive and safe service to our local school and community and looks forward to continuing to provide quality service for many more years to come." Three generations of business is not all the company has enjoyed. Thanks to drivers like Bruce Hardy, they have been building relationships through generations, Liesl's mother Carol also enjoys fond memories of riding Bruce Hardy's bus to the Octorara School District.

单选题As a politician, he knows how to {{U}}manipulate{{/U}} public opinion. A. express B. divide C. influence D. voice

单选题This species has nearly {{U}}died out{{/U}} because its habitat is being destroyed. A. turned dead B. passed by C. carried away D. become extinct

单选题 How the Body Keeps the Same Temperature The temperature of your body should be always just the same, no matter whether the weather is hot or cold. That is why the doctor uses his thermometer when you are sick. When you are well,your temperature is ninety-eight and six tenths degrees. If he finds it{{U}} (51) {{/U}}than that,it is a sure sign that something is wrong. The body keeps the same temperature all the time,because it balances (平衡) the heat it produces and{{U}} (52) {{/U}}off. It is always burning up food and producing heat. It can produce heat faster when it needs to or give off heat faster when it becomes too warm. Let's see{{U}} (53) {{/U}}this happens. The heat of your body is given off chiefly through the skin. When you are{{U}} (54) {{/U}},your skin is tight and shows "goose flesh". When you get chilly (寒冷的), you must dance around to keep warm or{{U}} (55) {{/U}}you will shiver (颤抖).{{U}} (56) {{/U}}your muscles begin to work,burn up fuel,and produce more heat. It is not{{U}} (57) {{/U}}to shiver,so you usually prefer warming up by exercise,or put{{U}} (58) {{/U}}more clothes to keep heat in. When you are warm,the skin is loose and soft. It is so supplied{{U}} (59) {{/U}}blood that heat is given off rapidly. If you get too hot,you begin to sweat,and{{U}} (60) {{/U}}body heat is used in evaporating (蒸发) the moisture (潮湿) from your skin. You wear less clothing, too,in warm {{U}}(61) {{/U}}or in a warm room,so that warmth can be given off freely. You feel you don't{{U}} (62) {{/U}} exercising because your body is warm{{U}} (63) {{/U}},and the extra heat produced by exercise makes you uncomfortable. You can see from this why you{{U}} (64) {{/U}}differently in different kinds of weather. In summer when it is warm,you feel tired and lazy. You do not care to work or play,but enjoy lying and doing nothing. When you get out of doors in winter,the cold air makes you feel{{U}} (65) {{/U}}. You want to run and play.