下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Seeing Red Means Danger Ahead The color red often means danger-and by paying attention，accidents can be prevented．In the future，the color red also may help{{U}} (51) {{/U}}danger at construction sites．Thanks to new work by engineers，bridge supports-or{{U}} (52) {{/U}}kinds of materials-could one day contain a color-changing material．It will turn red{{U}} (53) {{/U}}a structure collapses or falls apart． The secret{{U}} (54) {{/U}}the color-changing material is a particular type of molecule(分子)．A molecule is a group of atoms(原子)held together by chemical bonds．Molecules come{{U}} (55) {{/U}}all shapes and sizes，and make up{{U}} (56) {{/U}}you can see，touch or feel．How a molecule behaves depends on {{U}}(57) {{/U}}kinds of atoms it contains，and how they're held together． When a polymer(聚合物)containing a color-changing molecule called a mechanophore(机械响应性聚合物)is about to break，it produces a{{U}} (58) {{/U}}．When a polymer with mechanophore molecules becomes“injured”or{{U}} (59) {{/U}}，one of the mechanophore bonds{{U}} (60) {{/U}}and the material turns red．“It's a really simple detection method，”says Nancy Sottos，one of the scientists who worked on the project．Sottos and her team tested the color-changing polymers in their lab．The test{{U}} (61) {{/U}} proved encouraging． There is a way to get rid of the red color：light．When a bright light is shone on the mechanophore， the broken bond is fixed-and the red color{{U}} (62) {{/U}}．This“self-healing”may be a problem for engineers．They need to use the color-changer in big construction projects that will be{{U}} (63){{/U}}，in sunlight．And sunlight will make the mechanophore's warning system{{U}} (64) {{/U}}． Sottos and her fellow scientists still have{{U}} (65) {{/U}}work to do before the color-changing molecules can be used outside the lab．

阅读下面这篇短文，短文后列出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，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文章中没有提及，请选择C。 There's simple premise behind what Larry Myers does for a living: If you can smell it, you can find it. Myers is the founder of Auburn University's Institute for Biological Detection Systems, the main task of which is to chase the ultimate in detection devices--an artificial nose. For now, the subject of their research is little more than a stack of gleaming chips tucked away in a laboratory drawer. But soon, such a tool could be hanging from the belts of police, arson(纵火)investigators and food-safety inspectors. The technology that they are working on would suggest quite reasonable that, within three to five years, we'll have some workable sensors ready to use. Such devices might find wide use in places that attract terrorists. Police could detect drugs, bodies and bombs hidden in cars, while food inspectors could easily test food and water for contamination. The implications for revolutionary advances in public safety and the food industry are astonishing. But so, too, are the possibilities for abuse: Such machines could determine whether a woman is ovulating(排卵), without a physical exam--or even her knowledge, One of the traditional protectors of American liberty is that it has been impossible to search everyone. That's getting not to be the case. Artificial biosensors created at Auburn work totally differently from anything ever seen before. AromaScan, for example, is a desktop machine based on a bank of chips sensitive to specific chemicals that evaporate into the air. As air is sucked into the machine, chemicals pass over the sensor surfaces and produce changes in the electrical current flowing through them. Those current changes are logged into a computer that sorts our odors based on their electrical signatures. Myers says they expect to load a single fingernail-size chip with thousands of odor receptors (感受器), enough to create a sensor that's nearly as sensitive as a dog's nose.

阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 {{B}}Captain Cook Arrow Legend{{/B}} It was a great legend while it lasted, but DNA testing has{{U}} (1) {{/U}}ended a two-century-old story of the Hawaiian arrow carved from the bone of British explorer Captain James Cook{{U}} (2) {{/U}}died in the Sandwich Islands in 1779. "There is{{U}} (3) {{/U}}Cook in the Australian Museum," museum collection manager Jude Philip said not long ago in announcing the DNA evidence that the arrow was not made of Cook's bone. But that will not stop the museum from continuing to display the arrow in its{{U}} (4) {{/U}}, "Uncovered: Treasures of the Australian Museum," which{{U}} (5) {{/U}}include a feather cape presented to Cook by Hawaiian King Kalani'opu'u in 1778. Cook was one of Britain's great explorers and is credited with{{U}} (6) {{/U}}the "Great South Land,"{{U}} (7) {{/U}}Australia, in 1770. He was clubbed to death in the Sandwich Islands, now Hawaii. The legend of Cook's arrow began in 1824{{U}} (8) {{/U}}Hawaiian King Kamehameha on his deathbed gave the arrow to William Adams, a London surgeon and relative of Cook's wife, saying it was made of Cook's bone after the fatal{{U}} (9) {{/U}}with islanders. In the 1890s the arrow was given to the Australian Museum and the legend continued{{U}} (10) {{/U}}it came face-to-face with science. DNA testing by laboratories in Australia and New Zealand revealed the arrow was not made of Cook's bone but was more{{U}} (11) {{/U}}made of animal bone, said Philp. However, Cook's fans{{U}} (12) {{/U}}to give up hope that one Cook legend will prove true and that part of his remains will still be uncovered. As they say there is evidence not all of Cook's body was{{U}} (13) {{/U}}at sea in 1779. "On this occasion technology has won," said Cliff Thornton, president of the Captain Cook Society, in a{{U}} (14) {{/U}}from Britain. "But I am{{U}} (15) {{/U}}that one of these days...one of the Cook legends will prove to be time and it will happen one day." DNA n. 脱氧核糖核酸 Hawaiian adj.夏威夷的 Uncovered adj.被发掘的 cape n.斗篷 credit v.把……归功于 club v.用棍棒打 1. A. finally B. firstly C. lately D. usually 2. A. whose B. who C. which D. what 3. A. some B. none C. neither D. no 4. A. cinema B. exhibition C. shop D. market 5. A. must B. did C. has to D. does 6. A. discovering B. visiting C. traveling D. using 7. A. then B. now C. past D. previously 8. A. how B. where C. when D. that 9. A. conversation B. fight C. meal D. dance 10. A. however B. until C. after D. whenever 11. A. helpfully B. usefully C. likely D. readily 12. A. refuse B. return C. regain D. reply 13. A. collected B. washed C. stored D. buried 14. A. statement B. suggestion C. proposal D. guess15. A. safe B. weak C. sure D. lucky

阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 {{B}}Dark Forces Dominate Universe{{/B}} The Earth, moon, sun and all visible stars in the sky make up less than one percent of the universe. Almost all the rest is dark matter and dark energy, unknown{{U}} (1) {{/U}}that puzzle astronomers. Observations in recent years have changed the basic understanding of how the universe evolved and have emphasized for astronomers how little is known{{U}} (2) {{/U}}the major forces and substances that shaped our world. Astronomers now know that luminous matter-stars, planets and hot gas —{{U}} (3) {{/U}}only about 0.4 percent of the universe. Non. luminous components, such as black holes and intergalactic gas, make up 3.6 percent. The rest is either dark matter, about 23 percent, or dark energy, about 73 percent. Dark matter, sometimes called "cold dark matter" has been known for some{{U}} (4) {{/U}}. Only recently have researchers come to understand the pivotal role it{{U}} (5) {{/U}}in the formation of stars, planets and even people. "We owe our very existence to dark matter," said physicist Paul Steinhardt and a co-author of a review on dark matter which appeared not long{{U}} (6) {{/U}}in the journal Science. Steinhardt said it is believed that following the Big Bang, the theoretical{{U}} (7) {{/U}}of the universe, dark matter caused particles to clump together. That set up the gravitation processes that led to the formation of stars and galaxies. Those stars, in turn, created the basic chemicals, such as carbon and iron, that were{{U}} (8) {{/U}}to the evolution of life. "Dark matter dominated the formation of structure in the early universe." Steinhardt said. "For the first few billion years dark matter contained{{U}} (9) {{/U}}of the mass of the universe. You can think of ordinary matter as a froth of an Ocean of dark matter. The dark matter clumps and the ordinary matter falls into it. That led to the{{U}} (10) {{/U}}of the stars and galaxies." Without dark matter, "there{{U}} (11) {{/U}}be virtually no structures in the universe." The nature of dark matter is{{U}} (12) {{/U}}. It cannot be seen or detected{{U}} (13) {{/U}}. Astronomers know it is there because of its effect on celestial objects than can be seen and measured. But the most dominating force of{{U}} (14) {{/U}}in the universe is called dark energy, a i:ecently proven power that astronomers say is causing the galaxies in the universe to separate at a faster and faster speed. One scientist said it is clear now{{U}} (15) {{/U}}dark matter and dark energy engaged in a gravitational tug of war that. eventually, dark energy won. intergalactic adj. 银河间 pivotal adj.关键的 owe v. 把……归功于 clump v.凝聚成块 gravitation n.地心吸力，万有引力 froth n.泡沫 celestial adj.天体的 1. A. space B. movement C. forces D. speed 2. A. about B. in C. for D. witll in 3. A. waits for B. longs for C. accounts for D. looks for 4. A. schedule B. time C. duration D. period 5. A. displayed B. delayed C. relayed D. played 6. A. previously B. back C. before D. ago 7. A. beginning B. changing C. combining D. ending 8. A. universal B. additional C. fundamental D. structural 9. A. many B. most C. little D. few 10. A. detection B. formation C. revolution D. separation 11. A. would B. must C. shall D. should 12. A. unchecked B. unlocked C. unknown D. unmeasured 13. A. personally B. accurately C. formally D. directly 14. A. all B. total C. overall D. sum 15. A. when B. that C. how D. what

阅读下面的短文，文中有15处空白，每处空白给出了4个选项。 {{B}}Preferences Vary on Circumstance of Dying{{/B}} Among terminally iii people, attitudes differ on what they think constitutes a{{U}} (1) {{/U}}or bad death, the results of a new study suggest. Dr. Elizabeth K. Vig of the University of Washington in Seattle and colleagues interviewed 26 men with{{U}} (2) {{/U}}heart disease or cancer. The men were asked to describe good and bad deaths, and they also answered questions about their{{U}} (3) {{/U}}for dying. "In this small study, terminally ill men described good and bad deaths{{U}} (4) {{/U}}"Vig said. "They did not hold uniform views about such issues{{U}} (5) {{/U}}the presence of others at the very end of life or preferred location of death." Many of the men considered{{U}} (6) {{/U}}in their sleep to be a good death. The reasons were varied and included not{{U}} (7) {{/U}}that death was imminent, and that death would be painless. For close to half of the men, a prolonged death was{{U}} (8) {{/U}}a bad death. Some of the men equated a prolonged death with prolonged pain,{{U}} (9) {{/U}}othe. rs thought a prolonged death would be difficult for their families. Most men said that their{{U}} (10) {{/U}}were very important to them, but this did not mean that they wanted relatives close at the{{U}} (11) {{/U}}of death. "Valuing family did not also{{U}} (12) {{/U}}wanting family present at the very end of life," Vig said."In fact, some expressed concerns about{{U}} (13) {{/U}}loved ones," vig said. For instance, some men were worried about the emotional or{{U}} (14) {{/U}}impact on their family members, according to the Washington researcher. Sonic were worried{{U}} (15) {{/U}}their need for care would be a burden on their families, she said.imminent adv．即将发生(或来临)的(指危险、祸患、不幸等)equate vt．使等同 1. A. wrong B. pure C. good D. whole 2. A. either B. terminal C. final D. terrible 3. A. perfections B. presence C. preferences D. references 4. A. differently B. similarly C. strangely D. heartlessly 5. A. like B. as C. including D. for 6. A. working B. dying C. talking D. dreaming 7. A. regarding B. thinking C. wanting D. knowing 8. A. meant B. presented C. considered D. taken 9. A. when B. although C. because D. while 10. A. families B. friends C. colleagues D. wishes 11. A. beginning B. time C. period D. end 12. A. stand B. mean C. represent D. signal 13. A. missing B. helping C. burdening D. leaving 14. A. financial B. physical C. social D. historical 15. A. unless B. if C. why D. that

Cloning(克隆)：Future Perfect? 1 A clone is all exact copy of a plant or animal produced from any one cell. Since Scottish scientists reported that they had managed to clone a sheep named Dolly in 1997，research into cloning has grown rapidly．In May 1998，scientists in Massachusetts managed to create two identical calves(牛犊)using cloning technology．A mouse has also been cloned successfully， But the debate over cloning humans really started when Chicago physicist Richard Seed made a surprising announcement：“We will have managed to clone a human being within the next two years，”he told the world． 2 Seed’S announcement provoked a lot of media attention，most of it negative．In Europe， nineteen nations have already signed an agreement banning human cloning and in the US the President announced：”We will be introducing a law to ban all human cloning and many states in the US will have passed anti-cloning laws by the end of the year．’’ 3 Many researchers are not so negative about cloning，They are worried that laws banning human cloning will threaten important research．In March，The New England Journal of Medicine called any plan to ban research on cloning humans seriously mistaken．Many researchers also believe that in spite of attempts to ban it，human cloning will have become routine by 2010 because it is impossible to stop the progress of science．4 Is there reason to fear that cloning will lead to a nightmare world? The public has been bombarded(轰炸)with newspaper articles，television shows and films，as well as cartoons．Suchinformation is often misleading，and makes people wonder what on earth the scientists will be doing next． 5 Within the next five to ten years scientists will probably have found a way of cloning humans. It could be that pretty soon we will be able to choose the person that we want our child to look like．But how would it feel to be a clone among hundreds，the anti-cloners ask．Pretty cool, answer the pr-cloners(赞成克隆的人)．

阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 There is no good place to have a car crash -- but some places are worse than others. In a foreign country, for instance,{{U}} (1) {{/U}}to explain via cellphone that you are upside down in a ditch when you cannot speak the local language can fatally delay the arrival of the emergency services. But an answer may be at hand. Researchers funded by the European Commission are beginning tests of a system called E-merge that{{U}} (2) {{/U}}senses when a car has crashed and sends a text message telling emergency services in the local language that the accident has taken place. The system was{{U}} (3) {{/U}}by ERTICO, a transport research organization based in Brussels, Belgium. Cars are fitted with a cellphone-sized device attached{{U}} (4) {{/U}}the underside of the dashboard which is activated by the same sensor that triggers the airbag in a crash. The device{{U}} (5) {{/U}}a cellphone circuit, a GPS positioning unit and a microphone and loudspeaker. It registers the severity of the crash by{{U}} (6) {{/U}}the deceleration data from the airbag's sensor. Using GPS information, it works out which ootmtry the Car is in, and from this it determines{{U}} (7) {{/U}}which language to compose an alert message detailing precise location of the accident. The device then automatically makes a call to the local emergency services{{U}} (8) {{/U}}. If the car's occupants are conscious, they can communicate with the operator{{U}} (9) {{/U}}the speaker and microphone. E-merge also transmits the vehicles make, model, color and license number, and its heading when it crashed, which in rum indicates on which side of a multi-lane highway it ended up.' This{{U}} (10) {{/U}}the emergency services find the vehicle as soon as they arrive on the scene. "We can waste a large{{U}} (11) {{/U}}time searching for an incident," says Jim Hammond, a (an){{U}} (12) {{/U}}in vehicle technology at the Association of Chief Police Officers in the UK. Tests will begin soon with police car fleets in the UK. Trials have already started in Germany, Sweden, Spain, the Netherlands and Italy. In-car systems that summon the emergency services after a crash have{{U}} (13) {{/U}}been fitted in some premium cars. ERTICO says that{{U}} (14) {{/U}}EU states "are willing to fund the necessary infrastructure, E-merge could be working by 2008. A study by French car maker Renault concluded that the system could save up to 6000 of the 40, 000 lives lost each year on Europe's roads, and prevent a similar number of serious injuries. The Renault study estimates that fitting E-merge to every car in Europe would eventually save around 150 billion per{{U}} (15) {{/U}}in terms of reduced costs to health services and insurance companies, and fewer lost working days. cellphone n.移动电话，手机 underside n. 下侧；底面 dashboard n. (车辆的)挡泥板; (汽车的)仪表板 sensor n. 传感器；敏感元件 airbag n. (安全)气囊 severity n.严重(性) deceleration n.减速 occupant n. 占有人,占用者 1. A. try B. tried C. trying D. having tried 2. A. automatically B. accidentally C. tremendously D. usually 3. A. changed B. located C. developed D. copied 4. A. by B. up C. about D. to 5. A. forms B. is consisted of C. composed of D. includes 6. A. read B. reading C. reads D. being read 7. A. on B. in C. of D. at 8. A. car maker B. policeman C. doctor D. operator 9. A. via B. near C. by D. besides 10. A. assists B. causes C. makes D. helps 11. A. number of B. deal of C. amount of D. volume of 12. A. writer B. reporter C. expert D. leader 13. A. already B. long ago C. long before D. shortly 14. A. although B. nevertheless C. however D. if 15. A. city B. year C. person D. country

语法与词汇My uncle was an electrician.

语法与词汇It is (odd) that so little is known about the talented painter.

语法与词汇Electrical appliances such as toasters or hair dryers are designed to (take advantage of) the ability of an electric current to heat a wire.

语法与词汇The (course) of the Korean War was bitter, bloody and frustrating.

语法与词汇I wasn't {{U}}qualified{{/U}} for the job really, but I got it anyhow

语法与词汇People from many countries were (drawn) to the United States by the growing cities and industries.

语法与词汇The judge (suspected) the truth of the evidence provided by the witness.

语法与词汇The truck gained momentum as it rolled down the steep road.

语法与词汇Through a procedure known as time-sharing, one large computer can be employed (simultaneously) by lots of small users.

语法与词汇All foreign troops must (withdraw) from the country.

语法与词汇What is your {{U}}glad{{/U}} in life?

语法与词汇The number of the Unites States citizens who are (eligible) to vote continues to increase.

语法与词汇They joined the army (willingly).