单选题Cement was {{U}}seldom{{/U}} used in buildings of the Middle Ages. A.slight B.rarely C.originally D.occasionally

单选题 The Smog (烟雾) For over a month, Indonesia was in crisis. Forest fires raged out of control as the country suffered its worst drought for 50 years. Smoke from the fires mixed with sunlight and hot dry air to form a cloud of smog. This pollution quickly spread and within days it was hanging over neighbouring countries including Malaysia, Singapore and Thailand. When the smoke combined with pollution from factories and cars, it soon became poisonous (有毒的). Dangerous amounts of CO became trapped under the smog and pollution levels rose. People wheezed (喘息) and coughed as they left the house and their eyes watered immediately. The smog made it impossible to see across streets and whole cities disappeared as grey soot (烟灰) covered everything. In some areas, water was hosed (用胶管浇) from high-rise city buildings to try and break up the smog. Finally, heavy rains, which came came in November. Put out the fires and clear the air. But the environmental costs and health problems will remain Many people from South-Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes (汽车排放的废气) and factory pollution. Breathing problems could well increase and many non-sufferers may have difficulties for the first time. Wildlife has suffered too. In lowland forests, elephants, deer, and tigers have been driven out of their homes by smog. But smog is not just an Asian problem. In fact, the word was first used in London in 1905 to describe the mixture of smoke and thick fog. Fog often hung over the capital. Sometimes the smog was so thick and poisonous that people were killed by breathing problems or in accidents. About 4,000 Londoners died within five days as a result of thick smog in 1952.

单选题Winter is the toughest season for grasses and flowers to survive in desert.

单选题 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。 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 {{U}}(51) {{/U}} and can control a fast-moving ear. But how does an intelligent car control itself? There is a virtual(虚拟) driver in the smart car. This virtual driver has "eyes", "brains", "hands" and "feet" too. The minicameras {{U}}(52) {{/U}} each side of the ear are his "eyes" which {{U}}(53) {{/U}} the road conditions ahead of it. They watch the {{U}}(54) {{/U}} to the car's left and right. There is also a highly automatic driving {{U}}(55) {{/U}} in the car. It is the built-in computer, which is the virtual driver's "brain". His "brain" {{U}}(56) {{/U}} the speeds of other moving cars near it and analyzes their positions. Basing on this information, it chooses the {{U}}(57) {{/U}} path for the intelligent ear, and gives instructions to the "hands" and "feet" to act accordingly. In this way, the virtual driver {{U}}(58) {{/U}} his car. What is the virtual driver's best advantage? He reacts {{U}}(59) {{/U}} . The minicameras are bringing {{U}}(60) {{/U}} continuously to the "brain". It completes the processing of the images with-in 100 milliseconds. {{U}}(61) {{/U}} , the world's best driver needs at least one second to react. Besides, when he takes {{U}}(62) {{/U}}, he needs one more second. The virtual driver is really wonderful. He can reduce the accident {{U}}(63) {{/U}} considerably on expressways(高速公路). In this {{U}}(64) {{/U}}, can we let him have the wheel at any time and in any place? Experts {{U}}(65) {{/U}} 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Some physicists have proposed that sunspots and solar wind have negligible effects on the earth"s weather.

单选题My parents told me that we had relations in Canada and South Afric

单选题The city has decided to do away with all the old buildings in its center.

单选题The new company is well equipped and it can ______ around 10,000 bikes in one month.A. assembleB. serviceC. supplyD. repair

单选题 Electronic Teaching The potential of closed-circuit television and other new electronic teaching tools is so great that it is fascinating to visualize "the school of tomorrow". Televised lessons will originate from a central building having perhaps four or five master studios. The lessons will be carried into classrooms all over a city, or even an entire country. After a televised lesson has been given, the classroom teacher will take over for the all-important "follow-up" period. The students will ask any troublesome questions, and difficult points will be cleared up through discussion. The teacher in the classroom will have additional electronic tools. On the teacher's desk, the traditional chalk and erasers will have been replaced by a multiple-control panel and magnetic tape player. The tape machines will run pre-recorded lessons which pupils will follow by headphones. The lessons will be specifically geared to the students' levels of ability. For instance, while the class has a whole studies history, each student will receive an individual history lesson, directed to his particular level of ability. Should question arise, the students will be able to talk directly to the teacher on individual "intercoms" without disturbing the rest of the class. In this way, the teacher will be able to conduct as many as three classes at the same time. With the rapid development of computer science, students will be aided with specially prepared multimedia software to study their subjects better. Homework will possibly be assigned and handed in via electronic mail system. Students can even take examinations on their computer linked with the teachers' and get the score instantly. They will get certificates or diplomas if they pass all the required examinations. Experts believe that this type of education will be very popular in the years ahead.

单选题3. Will Anyone Watch 3-D TV? Mark the calendar: 2010 might be the year that TV's final frontier gets broken. Announced in early September, the newest models in the offing (马上就来临的) for late 2010 from Sony and Panasonic are bringing 3-D HDTV (高消晰度电视) into the home. That is, if you're willing to wear the glasses. Yes, glasses. They're not quite the flimsy red-and-blue-cellophane (玻璃纸) getups that they used to be, but the Sony and Panasonic models still require you to wear a pair of shades to observe the effect. How can TV manufacturers convince you that seeing shows in 3-D is worth the annoyance of having to wear a pair of specs (眼镜)? The first way is by making the technology way better. After all. 3-D entertainment is nothing new. The early 1950s were flooded with 3-D movies, and the technology has made an occasional comeback ever since. Each time, though, it's done in by the same complaints: poor image quality and headaches and eyestrain from extended viewing. Early reviews of the new models from Sony and Panasonic suggest they've solved the problem. Both use glasses that contain tiny shutters (快门), opening and closing at 120 frames per second, in sync with (与……同步)the image on the screen to give the illusion of depth. It's a new approach that gives users a wider viewing angle, another weakness of older approaches. All this would be pointless if the entertainment industry weren't also taking a new look at 3-D, The recent spate (一阵) of 3-D movies on the big screen-G-Force, Monsters vs Aliens and My Bloody Valentine all had 3-D debuts this year-foreshadows (预示) a similar spurt on the small screen. Blu-ray discs, which have the storage capacity necessary for high-definition 3-D content, and their players are becoming more affordable, and Panasonic is working with movie studios to release 3-D editions of movies, timed to coincide with the first group of TVs. Broadcast networks are paying close attention too-ESPN broadcast the Sept. 12 USC vs. Ohio State college-football game in 3-D as a pilot test. and in Britain there are already stations dedicated to 3-D content. But still. The glasses! The headgear(盔)necessary to watch modem 3-D TVs remains bulky-and, well, ugly-but Luxottica, maker of Ray-Ban, is working on a solution tot that. The company plans to release 3-D glasses modeled after Ray-Ban's classic Wayfarer (徙步旅行者) shades. giring even the style-conscious enthusiast little reason to resist 3-D.

单选题Flying in a westward direction will

单选题He feIt hopeless about his future.A. uselessB. carelessC. desperateD. confident

单选题The {{U}}eternal{{/U}} motion of the stars fascinated him. A. long B. never-ending C. boring D. extensive

单选题{{B}}第三篇{{/B}} {{B}} Hack{{/B}} The first big-name hackers include Steve Wozniak, Bill Gates and Linus Torvalds, all now highly recognizable names behind many of the computer technologies used today. These early hackers had a love of technology and a compelling need to know how it all worked, and their goal was to push programs beyond what they were designed to do. Back then, the word “hacker” didn’t have the negative connotation it has today. The original hacker ethic, rooted out of simple curiosity and a need to be challenged, appears to be dead. The objectives of early hackers are a far cry from the goals of today’s hacker. The motivation of the new breed of hackers appears not to be curiosity, or a hunger for knowledge, as it used to be. Instead, most of today’s hackers are driven by greed, power, revenge, or some other malicious intent, treating hacking as a game or sport, employing the tools that are readily available via the Internet. The rate of security attacks is actually outpacing the growth of the Internet. This means that something besides the growth of the Internet is driving the rise in security attacks. Here are some realities you should know about: Operating systems and applications will never be secure. New vulnerabilities will be introduced into your environment every day. And even if you ever do get one operating system secure, there will be new operating systems with new vulnerabilities—phones, wireless devices, and network appliances. Employees will never keep up with security polices and awareness. It doesn’t matter bow much you train and educate your employees. If your employees disregard warnings about the hazards of opening questionable e-mail attachments, bow are you going to educate them about properly configuring firewalls and intrusion detection systems for their PCs? Managers have more responsibility than ever. And on top of the realities listed above, security managers are being asked to support increasing degrees of network availability and access. There are some good security measures you can take: Employ a layer 7, full-inspection firewall. Automatically update your anti-virus at the gateway, server and client. Keep all of your systems and applications updated. Hackers commonly break into a Web site through known security holes, so make sure your servers and applications are patched and up to date. Turn off unnecessary network services. Eliminate all unneeded programs. Scan network for common backdoor services—Use intrusion detection systems, vulnerability scans, anti-virus protection.

单选题Because of {{U}}harsh{{/U}} weather conditions, more than a dozen states in the United States were declared disaster areas in 1977.

单选题Common-cold Sense You can"t beat it, hut you don"t have to join it. Maybe it got the name "common cold" because it"s more common in winter. The fact is, though, being cold doesn"t have anything to do with getting one. Colds are caused by the spread of rhinoviruses, and, at least so far, medical science is better at telling you how to avoid getting one than how to get rid of one. Children are the most common way cold viruses are spread to adults, because they have more colds than adults—an average of about eight per year. Why do kids seem so much more easily to get colds than their parents? Simple. They haven"t had the opportunity to become immune to many cold viruses. There are more than 150 different cold viruses, and you never have the same one twice. Being infected by one makes you immune to it—but only it. Colds are usually spread by direct contact, not sneezing or coughing. From another person"s hand to your hand and then to your nose or eyes is the most common route. The highest concentration of cold viruses anywhere is found under the thumbnails of a boy, although the viruses can survive for hours on skin or other smooth surfaces. Hygiene is your best defense. Wash your hands frequently, preferably with a disinfectant soap, especially when children in your household have colds. But even careful hygiene won"t ward off every cold. So, what works when a coughing, sneezing, runny nose strikes? The old prescription of two aspirins, lots of water, and bed rest is a good place to start. But you"ll also find some of the folk remedies worth trying. Hot mixtures of sugar (or honey), lemon, and water have real benefits.

单选题After fossil fuels are used up, global warming will continue for ___________.

单选题She {{U}}shed{{/U}} a few tears at her daughter's wedding. A. wiped B. injected C. produced D. removed

单选题I enjoyed the play; it had a clever plot and very funny dialogues.

单选题 下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。请根据文章的内容，从每题所给的4个选项中选择1个最佳答案。{{B}}第一篇{{/B}} {{B}} New Foods and the New World{{/B}} In the last 500 years, nothing about people -- not their clothes, ideas, or languages -- has changed as much as what they eat. The original chocolate drink was made from the seeds of the cocoa tree (可可树) by South American Indians. The Spanish introduced it to the rest of the world during the 1500's. And although it was very expensive, it quickly became fashionable. In London, shops where chocolate drinks were served became important meeting places. Some still exist today; The potato is also from the New World. Around 1600, the Spanish brought it from Peru to Europe, where it soon was widely grown. Ireland became so dependent on it that thousands of Irish people starved when the crop failed during the "Potato Famine (饥荒)" of 1845-1846, and thousands mere were forced to leave their homeland and move to America. There are many other foods that have traveled from South America to the Old World. But some others went in the opposite direction. Brazil is now the world's largest grower of coffee, and coffee is an important crop in Colombia and other South American countries. But it is native to Ethiopia, a country in Africa. It was first made into a drink by Arabs during the 1400's. According to an Arabic legend, coffee was discovered when a person named Kaldi noticed that his goats were attracted to the red berries on a coffee bush. He tried one and experienced the "wide-awake' feeling that one third of the world's population now starts the day with.