单选题Colleges in the US have added a new subject, "green chemistry", (51) their curriculum(课程) today. " Green chemistry (52) how we can develop products that won't (53) the environment," explains Paul Anastas, director of Yale University's Center for Green Chemistry and Green Engineering. It opened (54) the beginning of this year. The American Chemical Society, (55) approves more than 600 college chemistry programs, only lists about a dozen that teach green chemistry. But that (56) s growing。 Cambridge College in Massachusens is (57) "an introduction to green chemistry" course this fall and is offering the nation's first bachelor's and master's (58) in green chemistry. The program will have classes in environmental science and even environmental (59) and policy. These subjects are not (60) taught to chemistry majors. Employers (61) the introduction of green chemistry. Businesses are increasingly seeking graduates (62) backgrounds in the subject (63) it can help them make or save money in the development and manufacturing of products. "We need people (64) can not only understand their place (65) , but also understand the worldwide perspective," said Adam Peterson, a chemicals division manager at Dow Coming Corp.

单选题Bill Gates: Unleashing Your Creativity I've always been an optimist and I suppose that is rooted in my belief that the power of creativity and intelligence can make the world a better place. For as long as I can remember, I've loved learning new things and solving problems. So when I sat down at a computer for the first time in seventh grade, I was hooked. It was a chunky old teletype machine and it could barely do anything compared to the computers we have today. But it changed my life. When my friend Paul Allen and I started Microsoft 30 years ago, we had a vision of "a computer on every desk and in every home," which probably sounded a little too optimistic at a time when most computers were the size of refrigerators. But we believed that personal computers would change the world. And they have. And after 30 years, I'm still as inspired by computers as I was back in seventh grade. I believe that computers are the most incredible tool we can use to feed our curiosity and inventiveness to help us solve problems that even the smartest people couldn't solve on their own. Computers have transformed how we learn, giving kids everywhere a window into all of the world's knowledge. They're helping us build communities around the things we care about and to stay close to the people who are important to us, no matter where they are. Like my friend Warren Buffett, I feel particularly lucky to do something every day that I love to do. He calls it "tap-dancing to work". My job at Microsoft is as challenging as ever, but what makes me "tap-dancing to work" is when we show people something new, like a computer that can recognize your handwriting or your speech, or one that can store a lifetime's worth of photos, and they say, "I didn't know you could do that with a PC!" But for all the cool things that a person can do with a PC, there are lots of other ways we can put our creativity and intelligence to work to improve our world. There are still far too many people in the world whose most basic needs go unmet. Every year, for example, millions of people die from diseases that are easy to prevent or treat in the developed world. I believe that my own good fortune brings with it a responsibility to give back to the world. My wife, Melinda, and I have committed to improving health and education in a way that can help as many people as possible. As a father, I believe that the death of a child in Africa is no less poignant or tragic than the death of a child anywhere else, and that it doesn't take much to make an immense difference in these children's lives. I'm still very much an optimist, and I believe that progress on even the world's toughest problems is possible and it's happening every day. We're seeing new drugs for deadly diseases, new diagnostic tools, and new attention paid to the health problems in the developing world. I'm excited by the possibilities I see for medicine, for education and, of course, for technology. And I believe that through our natural inventiveness, creativity and willingness to solve tough problems, we're going to make some amazing in all these area in my life.

单选题Everyone in the class participated in the farewell party.A. contributed toB. took pleasure inC. took part inD. enjoyed

单选题Loud noises can be irritating. A．hateful B．annoying C．stimulating D．painful

单选题He picked a book from the bookshelf and then commenced to read.

单选题If you think that you can never replace that priceless painting, don't Udespair/U. All is not lost!

单选题Would you please call my husband as soon as possible?A. contactB. consultC. phoneD. visit

单选题下面的短文后列出了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；如果该句的信息文中没有提及，请选择C。 　　　　　　　　　　　　　　　　　　　{{B}}Water -- the Issue of This Century{{/B}} The world is running short of fresh water. Populations are growing bigger and thirstier(渴的), with the result that fresh water is becoming increasingly scarce(缺乏). Half the world's wetlands have disappeared during the last century, while estimates suggest that water use will rise by 50% in the next 30 years. The World Bank report estimates that as much as half of the world's population,concentrated in Aflica. the Middle East and south Asia, will face "severe water shortages" by 2025. Local water conflicts and the IOSS of freshwater ecosystems appear large in some regions. A similar picture emerges from the globe's salt water regions. Three-quarters of the world's people may live within 100km of the sea in 2025, putting even more pressure on stretched coastal ecosystems. Two thirds of fisheries(渔业)are exploited at or beyond their sustainable limits,and half the world's coral reefs(珊瑚礁)may perish in 100 years. Almost 60% of coral reefs and 340/oo of fish species are at risk from human activities, the Bank says. The report concludes that there is ample evidence to Justify immediate and coordinated action to safeguard supplies and use water more efficiently. Fresh water consumption is rising quickly, and the availability of water in some regions is likely to become one of the most pressing issues of the 21st century. A third of the world's population -- around two billion people -- live in countries that are experiening moderate to high water shortages. That proportion could rise to half or more in the next 30 years unless institutions(制度)change to ensure better conservation and allocation of water. China is one country where the portents(征兆)are gloomy, the most water-stressed country in East Asia. China is exploiting 44% of its usable water,a figure projected to rise to 60% by 2020. Primary withdrawal of water of more than 60% is widely considered by water experts to exceed the environmental carrying capacity of a river basin system. Although China's total use appears still to be reasonable, it has several basins that are severely stressed environmentally. Withdrawals exceed environmental limits in Afghanistan and Pakistan, and will exceed them in India by 2020. In the Middle East and North Africa, only Morocco has unexploited water resources. The rest hlave exceeded environmental limits and many are mining aquifers (蓄水层) -- bodies of water-bearing rock -- the report says.

单选题We had trouble finding a Upure /Uwater supply

单选题Many of Carson McCuller"s characters are isolated , disappointed people.

单选题Cell Phone Lets Your Secret out Your cell phone holds secrets about you. Besides the names and (51) that you've programmed into it, traces of your DNA linger on the device, according to a new study. DNA is genetic material that (52) in every cell. Like your fingerprint, your DNA is unique to you— (53) you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, or hair left (54) at the scene of a crime. The results often help detectives identify (55) and their victims. Your cell phone can reveal more about you (56) you might think. Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the (57) . This made her wonder whether traces of DNA lingered on cell phones—even when no blood was involved. (58) she and her colleague Margaret Wallace of the City University of New York analyzed the flip-open phones of 10 volunteers. They used swabs to collect (59) traces of the users from two parts of the phone: the outside, where the user holds it, and the (60) , which is placed at the user's ear. The scientists scrubbed the phones using a solution made mostly (61) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones (62) for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more. The scientists discovered DNA that (63) to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. (64) , DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the (65) of clues that can clinch a crime-scene investigation.

单选题If you want to acquire profound knowledge, you must start from the ABC.

单选题Two thirds of the sufferers of the disease were killed.A. patientsB. spreadersC. fansD. pioneers

单选题The Iceman On a September day in 1991，two Germans were climbing the mountains between Austria and Italy． High up on a mountain pass，they found the body of a man lying on the ice．At that height(10,499 feet， or 3,200 meters)，the ice is usually permanent，but 1991 had been an especially warm year．The mountain ice had melted more than usual and so the body had come to the surface． It was lying face downward．The skeleton(骨架)was in perfect condition，except for a wound in the head．There was still skin on the bones and the remains of some clothes．The hands were still holding the wooden handle of an ax and on the feet there were very simple leather and cloth boots．Nearby was a pair of gloves made of tree bark(树皮)and a holder for arrows． Who was this man?How and when had he died?Everybody had a different answer to these questions．Some people thought that it was from this century，perhaps the body of a soldier who died in World War I，since several soldiers had already been found in the area．A Swiss woman believed it might be her father，who had died in those mountains twenty years before and whose body had never been found．The scientists who rushed to look at the body thought it was probably much older，maybe even a thousand years old． With modern dating techniques，the scientists soon learned that the Iceman was about 5,300 years old．Born in about 3300 B．C．，he lived during the Bronze Age in Europe．At first scientists thought he was probably a hunter who had died from an accident in the high mountains．More recent evidence，how ever，tells a different story．A new kind of X-ray shows an arrowhead still stuck in his shoulder．It left only a tiny hole in his skin，but it caused internal damage and bleeding．He almost certainly died from this wound，and not from the wound on the back of his head．This means that he was probably in sortie kind of a battle．It may have been part of a larger war，or he may have been fighting bandits．He may even have been a bandit himself． By studying his clothes and tools，scientists have already learned a great deal from the Iceman about the times he lived in．We may never know the full story of how he died，but he has given us important clues to the history of those distant times．

单选题At first, all the people laughed at his ridiculous suggestion.A. amusingB. shockingC. frighteningD. foolish

单选题We can no longer Uput up with/U his actions.

单选题Mary just told us a very fascinating story.

单选题Their style of playing football is utterly different.

单选题Our English teacher is sick .

单选题For young children, getting dressed is a {{U}}complicated{{/U}} business.