单选题After a bitter debate, the decision was made that the capital of the United States be situated on the banks of the Potomac River. A. war B. election C. argument D. competition

单选题She is notable for her generous contribution for the relief of the poor.

单选题Save Energy at Home On the average, Americans waste as much energy as two-thirds of the world"s population consumes. That is largely the 1 of driving inefficient cars, using inefficient appliances (设备), and living and working in poorly insulated (隔热) buildings. Then what can you do to 2 the situation? Buy energy-efficient products. Buy new appliances or electronics of the highest energy-efficiency rating. New energy-efficient models may cost more initially, but have a lower operating 3 over their lifetimes. The most energy-efficient models 4 the Energy Star label, which identifies products 5 use 20～40 percent less energy than standard new products. According to the EPA (美国环境保护署), the typical American household can save about $400 per year in 6 bills with products that carry the Energy Star. Switch to compact fluorescent bulbs (荧光灯). Change the three bulbs you use 7 in your house to compact fluorescents. Each compact fluorescent bulb will keep half a ton of CO 2 out of the air 8 its lifetime. 9 , compact fluorescent bulbs last ten times as long and can save $ 30 per year in electricity costs. Set heating and cooling temperatures correctly. Check thermostats (温度自动调节器) in your home to make sure they are 10 at a level that doesn"t waste energy. Turn off the lights. Turn off lights and other electrical appliances such as televisions and radios when you"re not 11 them. Install automatic timers for lights that people in your house frequently 12 to turn them off when leaving a room. Let the sun shine in. The cheapest and most energy—efficient light and heat source is often right outside your window. On 13 days, open blinds (百叶窗) to let the sun light your home for free. Also remember that 14 entering a room equals passive solar heating. Even on cold winter days, sun streaming into a room can raise the temperature by several 15 .

单选题For young children, getting dressed is a complicated business.

单选题Most animal fats are saturated, containing more hydrogen than carbon, and do not spoil as easily as unsaturated fats.

单选题An Intelligent Car Driving needs sharp eyes, keen ears, quick brain, and coordination (协调) between hands and the brain. Many human drivers have all (1) and can control a fast -moving car. But how does an intelligent car control itself? There is a virtual (虚拟的) driver in the smart car. This virtual driver has "eyes,", "brains", "hands" and "feet", too. The minicameras (2) each side of the car are his "eyes", which (3) the road conditions ahead of it. They watch the (4) to the car's left and right. There is also a highly automatic driving (5) in the car. It is the built-in computer, which is the virtual driver's "brain". His "brain" (6) the speeds of other moving cars near it and analyzes their positions. Basing on this information, it chooses the (7) path for the intelligent car, and gives instructions to the "hands" and "feet" to act accordingly. In this way, the virtual driver (8) his car. What is the virtual driver's best advantage? He reacts (9) . The minicameras are bringing (10) continuously to the "brain". It completes the processing of the images within 100 milliseconds. (11) , the world's best driver needs at least one second to react. Besides, when he takes (12) , he needs one more second. The virtual driver is really wonderful. He can reduce the accident (13) considerably on expressways (高速公路). In this (14) , can we let him have the wheel at any time and in any place? Experts (15) that we cannot do that just yet. His ability to recognize things is still limited. He can now only drive an intelligent car on expressways.

单选题Italian ice cream is Uimitated/U all over the world.

单选题As a writer, he turned out three novels that year.

单选题She was close to success.

单选题The windchill factor, the combination of low temperature and wind speed, {{U}}strikingly{{/U}} increases the degree of cold felt by a person who is outdoors.

单选题The local government decided to merge the two firms into a big one. A. motivate B. combine C. compact D. nominate

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 admire his work.

单选题'Ice Explorer' Ready for Launch The European space agency's mission to assess the state of the world's ice cover is likely to launch in February. The Cryosat-2 spacecraft will go into orbit on a Dnepr rocket from Baikonur, Kazakhstan, the agency has announced. The satellite is a rebuild of the mission that was destroyed in 2005 when its launcher failed just minutes into its flight. Cryosat-2's radar instrument will make detailed maps of the ice that covers both sea and land at the poles. Data from other satellites has already indicated that some of this cover is diminishing at a rapid rate in response to climate change, with the biggest melting occurring in the Arctic. The completed Cryosat-2 is undergoing final checks here at the IABG technical centre in Ottobrunn near Munich, Germany, a test facility used by satellite manufacturers. It was hoped Cryosat. 2 could launch in December, lint the flight has been delayed now until next year. Esa said there was a queue of missions waiting for a ride on the Russian-Ukrainian Dnepr rockel. "Yes, it's frustrating, but that's how it is," conceded Volker Liebig, Esa's director of Earth observation programmes. "On the other hand it gives us a little bit more lime to [train and prepare the ground team],which means when we do get into orbit we'll be ready to start operations rapidly because of all the work we've done in advance," Mission managers are targeting 28 February for a launch. The inability of the agency to loft its satellites at a time of its choosing should become less of a problem when it has access to its new Vega rocket. Vega, which will operate out of Europe's Kourou spaceport in French Guiana, has been designed specifically to carry small institutional payloads such as Cryosat to orbit. However, the rocket is not expected to enter into service until the middle of next year. Cryosat-2 is part of Esa's Earth Explorer programme—seven spacecraft that will do innovative science in obtaining data on issees of pressing environmental concern. The first in the series, Goce (Gravity Field and Steady—State Ocean Circulation), was launched in March.

单选题Civil rights are embodied in the platform. A. included B. excluded C. expressed D. emerged

单选题Most of the job opportunities can now be found in the service industry.

单选题______ the 2012 Olympic Games will be held in London is not known yet.A. whetherB. ifC. wheneverD. that

单选题Susan reported her loss and gave all necessary particulars to police.A. detailsB. happeningsC. peculiaritiesD. qualification

单选题The Car Cars are an important part of life in the United States. Without a car most people feel that they are poor. And even if a person is poor he doesn"t feel really poor when he has a ear. Henry Ford was the man who first started making cars in large numbers. He probably didn"t know how much the car was going to affect American culture. The car made the United States a nation on wheels. And it helped make the United States what it is today. There are three main reasons why the car becomes so popular in the United States. First of all, the country is a huge one and Americans like to move around in it. The ear provides the most comfortable and cheapest form of transportation. With a car people can go anyplace without spending a lot of money. The second reason why cars are popular is the fact that the United States never really developed an efficient and inexpensive form of public transportation. Long-distance trains have never been as common in the country as they are in other parts of the world. Nowadays there is a good system of air-service provided by planes. But it is too expensive to be used frequently. The third reason is the most important one, though. The American spirit of independence is what really made ears popular. Americans don"t like to wait for a bus, or a train or even a plane. They don"t like to have to follow an exact schedule. A car gives them the freedom to schedule their own time. And this is the freedom that Americans want most to have. The gas shortage has caused a big problem for Americans. But the answer will not be a bigger system of public transportation. The real solution will have to be a new kind of car, one that does not use so much gas.

单选题In recent years, there has been an increased awareness of the importance of protecting the environment. The three Rs to keep in mind for a cleaner environment are "reduce, reuse, and recycle." First, reduce how much you use. It means shopping with the environment in mind: Consider the environmental impact of each product before you buy it. Make a list of what you need before you go shopping; this will reduce impulse buying. Buy in bulk-its cheaper and eliminates small containers and excess packaging. Besides, bulk merchandise may be shared with friends or neighbors. You should also avoid buying things that can't by recycled. What will the speaker talk about in the following part of his/her speech?A. How to achieve the other two Rs.B. How to share merchandise with friends or neighbors.C. How to select the goods one needs.D. How to reduce garbage littering at hom