单选题Is English a compulsory subject in primary schools?

单选题阅读下面这篇短文，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。 {{B}}Inventor of LED{{/B}} When Nick Holonyak set out to create a new kind of visible lighting using semiconductor alloys, his colleagues thought he was unrealistic. Today, his discovery of light-emitting diodes, or LEDs, are used in everything from DVDs to alarm clocks to airports. Dozens of his students have continued his work, developing lighting used in traffic lights and other everyday technology. On April 23, 2004, Holonyak received the $,500,000 Lemelson-MIT Prize at a ceremony in Washington. This marks the 10th year that the Lemelson-MIT Program at the Massachusetts Institute of Technology (MIT) has given the award to prominent inventors. "Anytime you get an award, big or little, it's always a surprise," Holonyak said. Holonyak, 75, was a student of John Bardeen, an inventor of the transistor, in the early 1950s. After graduate school, Holonyak worked at Bell Labs. He later went to General Electric, where he invented a switch now widely used in house dimmer switches. Later, Holonyak started looking into how semiconductors could be used to generate light. But while his colleagues were looking at how to generate invisible light, he wanted to generate visible light. The LEDs he invented in 1962 now last about 10 times longer than incandescent bulbs, and are more environmentally friendly and cost effective. Holonyak, now a professor of electrical and computer engineering and physics at the University of Illinois, said he suspected that LEDs would become as commonplace as they are today, but didn't realize how many uses they would have. "You don't know in the beginning. You think you're doing something important, you think it's worth doing, but you really can't tell what the big payoff is going to be, and when, and how. You just don't know," he said. The Lemelson-MIT Program also recognized Edith Flanigen, 75, with the $100,000 Lemelson-MIT Lifetime Achievement Award for her work on a new generation of "molecular sieves," that can separate molecules by size.

单选题According to Robert Bell, if mobile phones prove to be dangerous to people's health,

单选题He tried to assemble his thoughts.

单选题Urban Rainforest On the west side of the island of Manhattan in New York City, tree by tree, leaf by leaf, a 2,500 square foot sector of the Central African Republic"s Dzanga Ndoki Rainforest has been transported to, or recreated at, the American Museum of Natural History"s new hall of biodiversity. When the hall opens this May, visitors will visit one of the world"s biggest and most accurate reproduction of one of nature"s most threatened creations. To bring the rainforest to New York, a team of nearly two dozen scientists—the largest collecting expedition the museum has ever organized for an exhibit—spent five weeks in the African rainforest collecting soil, plants, and leaves; recording and documenting species; studying trees; shooting videotape and still photos; and interviewing local people. "This area has been explored very little," says Hoel Cracraft who estimates that the museum will eventually collect 150 to 180 mammals, more than 300 species of birds, hundreds of butterflies, and hundreds of thousands, if not millions, of organisms. The exhibition may even have produced a special prize—scientists suspect they have uncovered several new species. To give the forest a sense of realness, the back wall of the exhibit is an enormous videoscreen, sounds will come out from hidden speakers, and plans even call for forest smells. Computer controls will vary the effects so that no two walkthroughs will ever be exactly the same. After the team returned to New York, the forest was reproduced with the help of the computer Computer Modelling programmes plotted distances and special relationships. Artists studied photos and brought what they saw to life. Plaster trees were made. Recreated animals began to stand in the rainforest of the hall. Flying creatures will hang from the ceiling. The light in the forest—one of the exhibit"s cleverest recreations—will seem real. Long tube lights will have the correct colour and temperature to produce a natural effect. The plants and animals exhibited throughout the hall exist naturally in a perfect balance—remove one, and the whole is imperfect if not endangered. The exhibit is proof to the hope that the world"s rainforests will never exist solely as a carefully preserved artifact.

单选题What dreadful experience she has been through!A. terribleB. wonderfulC. niceD. cold

单选题A Minor Microsurgery Last year, Sean Martinovich, from Whitianga, had life-saving surgery when a golf-sized tumor was removed from his brain stem. But the operation left haft his face paralysed . He talked with a slur, sometimes dribbled(流口水) out of the side of his mouth and could not close his eye properly. Although he could run around with the other boys in the playground, when they laughed he could not laugh with them. Without a smile, he could suffer psychologically and emotionally. Last week, 6-year-old Sean had seven hours of microsurgery that should give him back his smile. Doctor Bartlett removed a nerve from the back of one of Sean"s legs and transplanted it into his face. On the normal side of his face the nerve divides into lots of little branches. "We"ll cut those nerve branches and then we"ll take a nerve graft from one leg and tunnel it across his face from one side to the other and join that on to the nerve that"s been cut on the good side of his face." Doctor Bartlett said before the operation. "If this was not fixed he could face physical and emotional problems as he got older," Doctor Bartlett said. "Socially people can become quite withdrawn because of the face paralysis. It"s easy for people, especially children, to become rather emotionless because they prefer the flatness of no movement on either side to the weirdness of an asymmetry of smiling on one side and having this twisted face. " Scan is not smiling yet. Over the next six months the nerves will grow across the face to the damaged side and after that movement will hopefully come back. Scan"s parents, Steve and Wendy Martinovich, said they had been through a year of hell. But their son was a determined boy who just got on with it, said Mrs Martinovich. They are amazed at the technology that they hope will restore the cheeky smile they love so much. For Doctor Bartlett the microsurgery is almost routine. For Scan"s parents, it is a miracle.

单选题Fewer and fewer credit cards are made of paper.

单选题London's First Light Rail System The Docklands Light Railway (DLR) took just three years to build at a cost of ￡77 million. It is London's first Light Rail System, but its route follows that of a number of older lines, which carried the nineteenth century railways through the crowed districts of the East End. The section of the line from the Tower Gateway Station to Poplar follows the line of one of London's earliest railways, the London on board each vehicle, Train Captains, who are also fully qualified drivers, are equipped with two-way radios to maintain contact with central control. There are passenger lifts, and self-service ticket machines, at every station.

单选题阅读下面的短文，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}}Animal's "Sixth Sense"{{/B}} A tsunami was triggered by an earthquake in the Indian Ocean in December, 2004. It killed tens of thousands of people in Asia and East Africa. Wild animals,{{U}} (51) {{/U}}, seem to have escaped that terrible tsunami. This phenomenon adds weight to notions that they possess a "sixth sense" for{{U}} (52) {{/U}}, experts said. Sri Lankan wildlife officials have said the giant waves that killed over 24,000 people along the Indian Ocean island's coast clearly{{U}} (53) {{/U}}wild beasts, with no dead animals found. "No elephants are dead, not{{U}} (54) {{/U}}a dead rabbit. I think animals can{{U}} (55) {{/U}}disaster. They have a sixth sense. They know when things are happening," H.D. Ratnayake, deputy director of Sri Lanka's Wildlife Department, said about one month after the tsunami attack. The{{U}} (56) {{/U}}washed floodwaters up to 2 miles inland at Yala National 'Park in the ravaged southeast, Sri Lanka's biggest wildlife{{U}} (57) {{/U}}and home to hundreds of wild elephants and several leopards. "There has been a lot of{{U}} (58) {{/U}}evidence about dogs barking or birds migrating before volcanic eruptions or earthquakes. But it has not been proven," said Matthew van Lierop, an animal behavior{{U}} (59) {{/U}}at Johannesburg Zoo. "There have been no{{U}} (60) {{/U}}studies because you can't really test it in a lab or field setting," he told Reuters. Other authorities concurred with this{{U}} (61) {{/U}}. "Wildlife seem to be able to pick up certain{{U}} (62) {{/U}}, especially birds... there are many reports of birds detecting impending disasters," said Clive Walker, who has written several books on African wildlife. Animals{{U}} (63) {{/U}}rely on the known senses such as smell or hearing to avoid danger such as predators. The notion of an animal "sixth sense" -- or{{U}} (64) {{/U}}other mythical 'power -- is an enduring one which the evidence on Sri Lanka's ravaged coast is likely to add to. The Romans saw owls{{U}} (65) {{/U}}omens of impending disaster and many ancient cultures viewed elephants as sacred animals endowed with special powers or attributes.

单选题She all but fainted when she heard the news.

单选题Winston became quite avaricious in his late life.

单选题Stock market price tumbled after rumor of a rise in interest rate.

单选题Our plan is to allocate one member of staff to handle appointments.A. assignB. persuadeC. askD. order

单选题The pleasure-centered people are too soon bored with each Usubsequent/U level of "fun".

单选题下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题定1个最佳选项。{{B}}第一篇{{/B}} Trying to Find a Partner One of the most striking findings of a recent poll in the UK is that of the people interviewed, one in two believes that it is becoming more difficult to meet someone to start a family with. Why are many finding it increasingly difficult to start and sustain intimate relationships? Does modern life really make it harder to fall in love? Or are we making it harder for ourselves? It is certainly the case today that contemporary couples benefit in different ways from relationships. Women no longer rely upon partners for economic security or status. A man doesn't expect his spouse to be in sole charge of running his household and raising his children. But perhaps the knowledge that we can live perfectly well without a partnership means that it takes much more to persuade people to abandon their independence. In theory, finding a partner should be much simpler these days. Only a few generations ago, your choice of soulmate (心上人) was constrained by geography, social convention and family tradition. Although it was never explicit, many marriages were essentially arranged. Now those barriers have been broken down. You can approach a builder or a brain surgeon in any bar in any city on any given evening. When the world is your oyster (牡蛎),you surely have a better chance of finding a pearl. But it seems that the old conventions have been replaced by an even fighter constraint: the tyranny of choice. The expectations of partners are inflated to an unmanageable degree: good looks, impressive salary, kind to grandmother, and right socks. There is no room for error in the first impression. We think that a relationship can be perfect. If it isn't, it is disposable. We work to protect ourselves against future heartache and don't put in the hard emotional labor needed to build a strong relationship. Of course, this is complicated by realities. The cost of housing and child-rearing creates pressure to have a stable income and career before a life partnership.

单选题Red flag was placed there as a token of danger.

单选题In statistics, the mathematical mean is obtained by dividing the {{U}}sum{{/U}} of a group of scores by the number of scores.

单选题阅读下面这篇短文，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。 Even plants can run a fever, especially when they' re under attack by insects or disease. But unlike humans, plants can have their temperature taken from 3,000 feet away—straight up. A decade ago, adapting the infrared(红外线) scanning technology developed for military purposes and other satellites, physicist Stephen Paley came up with a quick way to take the temperature of crops to determine which ones are under stress. The goal was to let farmers precisely target pesticide(杀虫剂) spraying rather than rain poison on a whole field, which invariably includes plants that don't have pest(害虫) problems. Even better, Paley's Remote Scanning Services Company could detect crop problems before they became visible to the eye. Mounted on a plane flown at 3,000 feet at night, an infrared scanner measured the heat emitted by crops. The data Were transformed into a color-coded map showing where plants were running "fevers". Farmers could then spot-spray, using 50 to 70 percent less pesticide than they otherwise would. The bad news is that Paley' s company closed down in 1984, after only three years. Farmers resisted the new technology and long-term backers were hard to find. But with the renewed concern about pesticides on produce, and refinements in infrared scanning, Paley hopes to get back into operation. Agriculture experts have no doubt the technology works. "This technique can be used on 75 percent of agricultural land in the United States," says George Oerther of Texas A&M. Ray Jackson, who recently retired from the Department of Agriculture, thinks remote infrared crop scanning could be adopted by the end of the decade. But only if Paley finds the financial backing which he failed to obtain 10 years ago.

单选题The boy slipped out of the room and headed for the swimming pool without his parents" consent .