【文章內(nèi)容簡介】 ist, says McQuade. Swimmers who then stay immobile on the pool bottom for 5 seconds or more are considered in danger of drowning. Poseidon doublechecks that the image really is of a swimmer, not a shadow, by seeing whether it obscures the pool39。s floor texture when viewed from overhead. If so, it alerts the lifeguard, showing the swimmer39。s location on a poolside screen.　　The first fullscale Poseidon system will be officially opened next week at a pool in High Wybe. Buckinghamshire. One man who is impressed with the idea is Travor Baylis, inventor of the clockwork radio. Baylis runs a pany that installs swimming pools, and he was once an underwater escapologist with a circus. I say full marks to them if this works and can save lives, he says. But he adds that any local authority spending 30,000plus on a Poseidon system ought to be investing similar amounts in teaching children to swim.　　31. AI means the same as　　A. an image.　　B. an idea.　　C. anyone in the water.　　D. artificial intelligence.　　32. What is required of AI software to save a life?　　A. It must be able to swim.　　B. It must keep walking round the pool.　　C. It can distinguish between a swimmer and a shadow.　　D. It can save a life within a few months.　　33. How does Poseidon save a life?　　A. He plunges into the pool.　　B. It alerts the lifeguard.　　C. He cries for help.　　D. It rushes to the pool.　　34. Which of the following statements about Trevor Baytis is NOT true?　　A. He runs.　　B. He invented the clockwork radio.　　C. He was once an entertainer.　　D. He runs a pany.　　35. The word considered in paragraph 5 could be best replaced by　　A. thought.　　B. rated.　　C. regarded.　　D. believed.　　第二篇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 pletely unthinkable : Can building he 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, . Our immediate hope is that we can develop a better understanding as to why those buildings remain standing, while our longterm 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, hut 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. Whhittaker,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 was quite rugged, allowing floors that were pierced by ions of falling debris to remain intact. ttighly 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. Rcinhorn, Pb. D. noted that earthquake shaking has led to the collapse of many buildings in the past. h induces dynamic response and extremely high stresses and deformations in structural ponents.　　Solutions developed for earthquakeresistant 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.　　36. The question raised in the first paragraph is one__________　　A. that was asked by structural engineers a month ago　　B. that is too difficult for structural engineers to answer even now　　C. that was never thought of before the terrorist attack　　D. that terrorists are eager to find a solution to　　37. The project funded by the National Science Foundation__________　　A. was first proposed by some engineers at UB　　B. took about two days to plete　　C. was to investigate the damage caused by the terrorist attack　　D. was to find out why some buildings could survive the blasts　　38. The column mentioned by Dr. Whittaker__________　　A. was part of the building close to the World Trade Center　　B. was part of the World Trade Center　　C. was shot through the window and the floor of the World Trade Center　　D. damaged many buildings in the vicinity of the World Trade Center　　39. A surprising discovery made by the investigators during their visit to ground zero is that__________　　A. floors in the adjacent buildings remain undamaged　　B. some floor framing systems demonstrate resistance to explosion　　C. simple floor framing systems are more blast resistant　　D. floors in one of the adjacent buildings were pierced by tons of debris　　40. What Dr. Reinhorn sa