单选题Thousands of years ago man used handy rocks for his surgical operations. Later he used sharp bones or horns, metal knives and more recently, rubber and plastic. In the 1960s a new tool was developed, one which was, first of all, to be of great practical use to the armed forces and industry, but which was also to revolutionize the art and science of surgery. The tool is the laser and it is being used by more and more surgeons all over the world. As we all know, light is hot, and any source of light will give warmth. But light is usually spread out over a wide area. The light in a laser beam, however, is concentrated. This means that a light with no more power than that produced by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam. Experiments with these pinpoint beams showed researchers that different energy sources produce beams that have a particular effect on certain living cells. It is now possible for eye surgeons to operate on the back of human eye without harming the front of the eye, simply by passing a laser beam right through the eye-ball. Operations which once left patients exhausted and in need of long period of recovery time now leave them feeling relaxed and comfortable. The rapid development of laser techniques in the past ten years has made it clear that the future is likely to be very exciting. Perhaps some cancers will be treated with laser in a way that makes surgery not only safer but also more effective.

单选题Today we are going to know something about Santa Fe, the capital city of New Mexico, USA. Santa Fe is in the central part of the state, on the Santa Fe River, flowing into the Rio Grande 35 kilometers west of the city. It is more than two thousand meters above sea level, and it is located in the Sangre de Cristo Mountains with the Ortiz Mountains to the southeast. It was said that the Spanish founded Santa Fe in 1609 which was only an old Indian village. The Indians made the place under their control in 1680, but after twelve years Santa Fe was in the Spanish"s possession again. The city was out of Spanish rule when Mexico got its independence (独立) in 1821. Ever since then, it was known as a Mexican city. However, it was taken over by American troops in 1846. Santa Fe is now the second largest city in the state, the population of which is 48,953. It is a good place for people to spend holiday, as the weather is pleasant. It also has complex history and is surrounded by mountains. Apart from hunting and skating in the mountains, people also enjoy shopping in the Indian and Spanish shops, which benefits a lot to the city"s income every year. There is an international opera season in summer, and operas are shown in a partly-roofed, open-air theatre daily for people coming from all parts of the world. So you can"t miss it if you have chance to travel to America.

单选题--Would you like some butter? --No, thanks. I'm ______ a diet.

单选题Why do people go on a diet?

单选题What has the man been looking forward to?

单选题Not only I but also Jane and Mary ______tired of having one examination after another.[A] be[B] are[C] am[D] is

单选题New York, London, Paris and other big cities are exciting places to live in. There are many interesting things to see and to do. You can go to different kinds of museums, plays and films. You can also go shopping to buy things from all over the world. But there are serious problems in big cities too. The cost of living is high, and there are too many people in some of big cities. Every year many people move to the cities because there are some chances to find jobs, to study at good schools, and to receive good medical care. But sometimes these people cannot find work or a good place to live in. Also, too many people in a small space make it hard to keep the cities safe and clean. Some people enjoy living in big cities. Others do not. Before people move to big cities, they should think about the problems of living there.

单选题Of all the stories here, I like this one ______ It's not interesting at all.[A] most[B] best[C] worst[D] least

单选题{{B}}E{{/B}} EVENTS Bicycle tour and race A bike tour and race will be held on July 26 and 27(Sat. & Sun.). At 4:30 a. m. , the riders will leave Tian' anmen Square and ride the first 35 kilometers as a training {{U}}leg{{/U}}. Then the next 55-kilometre leg, from Yanjiao to Jixian, will be the first competitive(竞争性的) part of the tour. The riders and their bikes will then be taken from Jixian to Changli. The second racing leg of the tour will be from Changli to the seaside at Nandaihe, coveting a distance of 20 kilometers. Saturday night includes the stay at Nandaihe and supper. Sunday morning is free at the seaside. At noon all the people and their bikes will be taken back to Beijing. Cost: 200 yuan Telephone: 4675027 Brazilian footballers The Brazilian Football Club will play Beijing Guoan Team at the Workers Stadium on July 26. The club has several national team players. Also coming is 1994 US World Cup star Romario who has promised to play for at least 45 minutes. Ticket prices: 60 yuan, 100 yuan, 150 yuan Time/Date : 4: 30 p. m., July 26 (Sat.) Telephone : 5012372 Rock climbing The Third National Rock Climbing Competition will be held on July 26～27 at the Huairou Mountain Climbing Training Base. More than 10 teams from Beijing, Wuhan, Dalian, Jilin and other places will take part in it. A Japanese team will give an exhibition of climbing. Free for spectators (观众). Take a long-distance bus from Dongzhimen to Huairou. Time/Dates :9～12 a. m., July 26 and 27 Telephone : 7143177, 7144850, Wang Zhenghua

单选题The men will have to wait all day ______ the doctor works faster.

单选题—Don't stop trying. —______. Success is coming. A．Yes, we don't B．Yes, we'll try our best C．No, of course not D．No, you can't

单选题Why was young Chaplin waiting outside the back entrances of the theatres?

单选题All we have a clock located inside our brains. Similar to your bedside alarm clock, your internal clock runs on a 24-hour cycle. This cycle, called a circadian rhythm, helps control when you wake, when you eat and when you sleep. Somewhere around puberty, something happens in the timing of the biological clock. The clock pushes forward, so adolescents and teenagers are unable to fall asleep as early as they used to. When your mother tells you it's time for bed, your body may be pushing you to stay up for several hours more. And the light coming from your computer screen or TV could be pushing you to stay up even later. This shift is natural for teenagers. But staying up very late and sleeping late can get your body's clock out of sync with the cycle of light and dark. It can also make it hard to get out of bed in the morning and may bring other problems, too. Teenagers are put in a kind of a gray cloud when they don't get enough sleep, says Mary Carskadon, a sleep researcher at Brown University in Providence, RI. It affects their mood and their ability to think and learn. But just like your alarm clock, your internal clock can be reset. In fact, it automatically resets itself every day. How? By using the light it gets through your eyes. Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal clocks. For years, researchers thought that the signals that synchronize the body's clock were handled through the same pathways that we use to see. But recent discoveries show that the human eye has two separate light-sensing systems. One system allows us to see. The second system tells our body whether it's day or night.

单选题______, if you like politics, polls can be great entertainment.[A] At a least[B] At end[C] At the very least[D] At last

单选题 听第7段材料，回答第8～9题。

单选题She prepared ______ good meals for the family that no one ever thought of going out to eat. A. so B. such C. even D. ever

单选题What are the two speakers talking about?

单选题What was the girl's main purpose in going to New York during the vacation?