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.

单选题Monarch without a Kingdom This November, a hundred million butterflies will drop from the sky over Mexico, like autumn leaves. But for how long? Genetically modified maize (玉米) could mean extinction for this beautiful butterfly, Rafael Ruiz reports. Although its body is about 3 cm long and it only weighs 1 gin, the Monarch butterfly manages to travel 5,000 km each year. It seems to be so fragile, but its long journeys are proof of its amazing ability to survive. This autumn, the Monarch butterfly will once more set out on its journey from the U. S. It will keep going until it reaches Mexico. It travels these huge distances to escape the cold weather in the north. In November, millions of Monarchs fall like bright, golden rain onto the forests in the mountains of central Mexico. In the silence of these mountains you can hear a strange flapping (拍动) of wings, as the Monarchs arrive at their destination. In the mountains, which reach a height of 3,000 meters, the butterflies are safe. Before reaching their journey"s end they have faced strong winds, rain and snowstorms and they do not all manage to reach their destination. When the winters are really bad, perhaps 70 per cent of them will not survive. Their long journey to Mexico is thought to be one of the most amazing events in the whole of the American continent. When they get there they will stay until the beginning of April, when their internal calendar tells them that it is time to go back. The long journey, with all its dangers, begins again. These delicate creatures now face danger of another kind—from scientific progress. In the U. S., millions of farms grow genetically modified maize which is pure poison for the butterfly. Laboratory experiments have shown that half of the butterflies which feed on the leaves of genetically modified maize die within 48 hours. Not all experts agree that this variety of maize is responsible for the threat to the Monarchs. In spite of these doubts, the European Union has refused to approve new crops of genetically modified maize until further investigations have been carried out. Greenpeace is campaigning against genetically modified products (in Spain, there are already 20,000 hectares of modified maize ). The environmental organization recently published a list of 100 species of butterfly in Europe alone which are threatened with extinction.

单选题A. using photos B. description of the HTML page C. current popular search engines D. document search E. information in images F. machine vision systems The new system does document retrieval by

单选题The Race into Space American millionaire Dennis Tito will always be famous. He was the first tourist in space. "I spent sixty years on Earth and eight days in space and from my viewpoint, it was two separate lives," Tito explained. He loved his time in space. "Being in space and looking back at earth is one of the most rewarding experiences a human being can have." This kind of experience isn't cheap. It cost $ 20 million. However, Tito achieved his dream so he was happy. "For me it was a life dream. It was a dream that began when I didn't have any money," he told reporters. On 30 April 2002, Mark Shuttleworth became the world's second space tourist. Shuttleworth is a South African businessman. At the age of twenty-eight he also paid $ 20 million for the eight-day trip. Both Tito and Shuttleworth bought their tickets from a company called Space Adventures. The company has around 100 people already on their waiting list for flights into space. The spaceship to take them doesn't exist yet. Many of the customers are people who like adventure. They are the kind of people who also want to climb Mount Qomolangma. Other customers are people who love space. However, these people are worried. Because it's so expensive, only very rich people can go into space. They want space travel to be available to more people. That day may soon be here. Inter Orbital Systems (IOS) plans to send up to four tourists a week into space. The tours will depart from an island in Tonga. The company promises a package that includes forty-five days of astronaut training in Russia and California, seven days in space, and a vacation in Tonga for $2 million. However, space flight is still very dangerous. Bill Readdy is NASA's deputy assistant administrator for space flight. He says that the chances of dying are about 1 in 500. Because of this it may take time before space tourism really takes off. You might be able to go up, but will you come down?

单选题According to the passage, it may soon be possible

单选题At the meeting both sides exchanged their views on a wide scope of topics they were interested in.A. extentB. numberC. collectionD. range

单选题What is the writer’s attitude to robots in the future?

单选题In short, I am going to live there myself.A. In other wordsB. That is to sayC. In a wordD. To be frank

单选题Life as we know exists on the earth because the atmosphere _________.