单选题There was a {{U}}profound{{/U}} silence after his remark．

单选题This sort of thing is bound to happen. A. sure B. quick C. fast D. swift

单选题The study also notes a steady decline in the number of college students taking science courses.A. relativeB. continuousC. generalD. sharp

单选题The synergy of humans, society and machines is the fundmental cause of the unparalleled material prosperity of many nations. A. unpopular B. unpredictable C. unquestionable D. unprecedented

单选题The high-speed trains can have a {{U}}major{{/U}} impact on travel preferences.

单选题I expect that she will be able to {{U}}cater for{{/U}} your particular needs.

单选题Can Buildings Be Designed to Resist Terrorist Attack In the aftermath of the terrorist attack on the World Trade Center, structural engineers are trying hard to solve a question that a month ago would have been completely unthinkable: Can building be designed to withstand catastrophic blasts inflicted by terrorists? Ten days after the terrorist attacks on the twin towers, structural engineers from the University at Buffalo and the Multidisciplinary Center for Earthquake Engineering Research (MCEER) headquartered at UB traveled to ground zero as part of a project funded by the National Science Foundation. Visiting the site as part of an MCEER reconnaissance visit, they spent two days beginning the task of formulating ideas about how to design such structures and searching for clues on how to do so in buildings that were damaged, but still are standing. "Our objective in visiting ground zero was to go and look at the buildings surrounding the World Trade Center, those buildings that are still standing, but that sustained damage," said M. Bruneau, Ph.D. "Our immediate hope is that we can develop a better understanding as to why those buildings remain standing, while our long-term goal is to see whether earthquake engineering technologies can be married to existing technologies to achieve enhanced performance of buildings in the event of terrorist attacks," he added. Photographs taken by the investigators demonstrate in startling detail the monumental damage inflicted on the World Trade Center towers and buildings in the vicinity. One building a block away from the towers remains standing, but was badly damaged. "This building is many meters away from the World Trade Center and yet we see a column there that used to be part of that building", explained A. Whittaker, Ph. D. "The column became a missile that shot across the road, through the window and through the floor." The visit to the area also revealed some surprises, according to the engineers. For example, the floor framing systems in one of the adjacent buildings were quite rugged, allowing floors that were pierced by tons of falling debris to remain intact." Highly redundant ductile framing systems may provide a simple, but robust strategy for blast resistance," he added. Other strategies may include providing alternate paths for gravity loads in the event that a load-bearing column fails." We also need a better understanding of the mechanism of collapse, "said A. Whittaker. "We need to find out what causes a building to collapse and how you can predict it." A. Reinhorn, Ph.D. noted that "earthquake shaking has led to the collapse of many buildings in the past. It induces dynamic response and extremely high stresses and deformations in structural components. Solutions developed for earthquake-resistant design may be directly applicable to blast engineering and terrorist-resistant design. Part of our mission now at UB is to transfer these solutions and to develop new ones where none exist at present. /

单选题A new crater, which was to the south of the old one, was formed after the second eruption.

单选题Sports Star Yao Ming If Yao Ming is not the biggest sports star in the world, he is almost certainly the tallest. At 2.26m, he is the tallest player in the National Basketball Association (NBA) and holds the record as the most towering Olympian ever to compete in the Gaines. But what really stands out about the giant center is his celebrity (名气). Few, if any, Chinese athletes are as well-known as Yao around the world. People across the globe are fascinated with Yao, not only for his basketball prowess (杰出的才能) but also for being a symbol of international commerce. When Yao joined the Houston Rockets as the No. 1 pick in the 2002 NBA draft (选拔), he was the first international player ever to be selected first. His assets on the court are clear enough—no NBA player of his size has ever possessed his mobility, so he is a handful (难对付的人) for opponents on either end of the court. But what makes Yao invaluable to the Rockets organization is his role as a global citizen and as a bridge to millions of potential basketball fans in China. When it was announced in February that Yao would miss the rest of the NBA season and possibly the Olympics with a stress fracture (骨折) in his left foot, a collective shudder (震动) spread across China. After considerable debate and discussion, Yao opted to get his foot surgically treated in an operation that placed several tiny screws across the bone, to offer his overburdened foot more support. The surgery was a success, and though the estimated four-month recovery period will leave him little time to prepare with Team China, Yao has vowed to be ready for the Beijing Olympics. Yao wrapped up a 10-day trip to China, where he underwent a series of traditional Chinese medicine (TCM) treatments, hoping to accelerate his recovery process. Western experts are generally skeptical of TCM"s benefits, although new research from the University of Rochester suggests that a certain compound derived from shellfish may indeed stimulate bone repair. "There is no reason to dismiss TCM," Yao told a press conference in Beijing. "It"s been used in our country for thousands of years. I don"t think that it"s short on science. "

单选题She gets （aggressive） when she is drunk.

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。 In the United States, the need to protect plant and animal species has become a highly controversial and sharply political issue since the passage of the Endangered Species Act in 1973. The act, designed to protect species' living areas, and policies that preserve land and forests compete with economic interests. In the 1990's, for example, the woodcutters in the Western United States were challenged legally in their attempt to cut trees for timber in the Cascade Mountains. The challenge was mounted to protect the endangered spotted owl(猫头鹰), whose remaining population occupies these forests and requires the intact, ancient forest for survival. The problematic situation set the interests of environmentalists against those of corporations and of individuals who stood to lose jobs. After months of debate and legal battles, the fate of the woodcutters—and the owls—was still undecided in mid-1992. Similar tensions exist between the developed and the developing nations. Many people in industrialized nations, for example, believe that developing nations in tropical regions should do more to protect their rain forests and other natural areas. But the developing countries may beimpoverished(使穷困), with populations growing so rapidly that using the land is a means to temporarily avoid worsening poverty and starvation. Many of the changes to Earth that concern scientists have the potential to rob the planet of its biological richness. The destruction of Earth' s ozone layer(臭氧层), for example, could contribute to the general process of impoverishment by allowing ultra-violet rays to harm plants and animals. And global warming could wipe out species unable to quickly adapt to changing climates. Clearly, protecting will come only through coordinated international efforts to control human population, stabilize the composition of the atmosphere, and preserve intact Earth' s complex web of life.

单选题Controlling Robots with the Mind Belle, our tiny monkey, was seated in her special chair inside a chamber at our Duke University lab. Her right hand grasped a joystick(操纵杆) as she watched a horizontal series of lights on a display panel. She knew that if a light suddenly shone and she moved the joystick left or right to correspond to its position, she would be sent a drop of fruit juice into her mouth. Belle wore a cap glued to her head. Under it were four plastic connectors, which fed arrays of microwires-each wire finer than the finest sewing thread-into different regions of Belle"s motor cortex(脑皮层), tile brain tissue that plans movements and sends instructions. Each of the 100 microwires lay beside a single motor neuron(神经元). When a neuron produced an electrical discharge, the adjacent microwire would capture the current and send it up through a small wiring bundle that ran from Belle"s cap to a box of electronics on a table next to the booth. The box, in turn, was linked to two computers, one next door and the other half a country away. After months of hard work, we were about to test the idea that we could reliably translate the raw electrical activity in a living being"s brain-Belle"s mere thoughts-into signals that could direct the actions of a robot. We had assembled a multi-jointed robot arm in this room, away from Belle"s view, which she would control for the first time. As soon as Belle"s brain sensed a lit spot on the panel, electronics in the box running two real-time mathematical models would rapidly analyze the tiny action potentials produced by her brain cells. Our lab computer would convert the electrical patterns into instructions that would direct the robot arm. Six hundred miles north, in Cambridge, Mass, a different computer would produce the same actions in another robot arm built by Mandayam A. Srinivasan. If we had done everything correctly, the two robot arms would behave as Belle"s arm did, at exactly the same time. Finally the moment came. We randomly switched on lights in front of Belle, and she immediately moved her joystick back and forth to correspond to them. Our robot arm moved similarly to Belle"s real arm. So did Srinivasan"s. Belle and the robots moved in synchrony (同步), like dancers choreographed(设计舞蹈动作) by the electrical impulses sparking in Belle"s mind. In the two years since that day, our labs and several others have advanced neuroscience, computer science and microelectronics to create ways for rats, monkeys and eventually humans to control mechanical and electronic machines purely by "thinking through," or imagining, the motions. Our immediate goal is to help a person who has been unable to move by a neurological(神经的) disorder or spinal cord(脊髓) injury, but whose motor codex is spared, to operate a wheelchair or a robotic limb.

单选题She was grateful to him for being so good to her. A．helpful B．hateful C．delightful D．thankful

单选题I have been trying to {{U}}quit{{/U}} smoking.

单选题The most Ucrucial/U problem any economic system faces is how to use its scarce resources.

单选题One theory postulates that the ancient Filipinos came from India and Persia.

单选题A gift to the United States from France, the Statue of Liberty was assembled and dedicated in 1886. A. repaired B. brought over C. unpacked D. put together

单选题Professor Clark continued his research work and disregarded his colleague's advice.A. ignoredB. exploredC. realizedD. recognized

单选题Sex Change Surgery Guidelines Drafted China is set to issue its first clinical guideline on sex-change surgery, according to a notice put on the website of the Ministry of Health yesterday. The ministry is now soliciting(征求) public and professional 1 on the draft guideline. The coming guideline aims to regulate and standardize sex reassignment surgery. Experts 2 nearly 2,000 Chinese have undergone sex-change surgery while 100,000 to 400,000 are still considering it. However, no official number is available. In the draft, the MOH sets minimum 3 for both surgical candidates and medical institutions. Candidates for the surgery must be older than 20 and single, the draft guideline said. They are also required to prove a persistent 4 for a sex change, to live for at least five consecutive years full-time in the new gender role, and to engage in mental therapy for at least one year. Before surgery can take place, a candidate must receive a recommendation for the operation from a 5 after an appropriate series of therapy sessions. Also, several legal requirements must be met 6 the procedure. The candidate must provide proof from police that he or she does not have any criminal 7 in the past. Police must also agree to change the sex status on the identity card of the prospective (未来的) receiver before the 8 can take place. The advent (出现) of such a guideline is believed to show that the government is concerned 9 the needs of a relatively small number of people who want to change sex. But doctors also warn 10 all stakeholders, including the hospital and prospective receivers, should be highly cautious about this surgery. The operation is more than a medical 11 due to its huge social and legal consequences. Doctors should make it clear to those 12 sex-change surgeries that the option always remains to continue to live in the original role. The guideline 13 surgeons to tell patients about other options such as hormone therapy. They are also required to explain the 14 involved, and underlying social barriers including discrimination, and administrative recognition and approval. For the candidates, the surgery itself is not the 15 issue in the long run. The real issue is the kind of life he or she will have to lead afterward.

单选题The poet William Carlos Williams was a New Jersey physician.A. doctorB. professorC. teacherD. Student