未知题型 回答{TSE}题： Ants as a Barometer of Ecological Change At picnics, ants are pests. But they have their uses. Inindustries such as mining, farming and forestry, they can help gauge the healthof the environment by just crawling around and being antsy. It has been recognized for decades that ants-which are highlysensitive to ecological change can provide a near-perfect barometer of thestate of an ecosystem. Only certain species, for instance,will continue tothrive at a forest site that has been cleared of trees.46__________And stillothers will move in and take up residencE.By looking at which species populate a deforested area,scientists can determine how 'stressed' the land is. 47__________Ants are used simply becausethey are so common and comprise so many species. Where mine sites are being restored, for example, some antspecies will recolonize the stripped land more quickly than others. 48__________Australianmining company Capricorn Coal Management has been successfully using antsurveys for years to determine the rate of recovery of land that it isreplanting near its German Creek mine in QueenslanD.Ant surveys also have been used with mine-site recoveryprojects in Africa and Brazil, where warm climates encourage dense and diverseant populations. 'We found it worked extremely well there,' saysJonathan Majer, a professor of environmental biology. Yet the surveys areperfectly suited to climates throughout Asia, he says, because ants are socommon throughout the region. As Majer puts it:'That's the great thingabout ants. ' Ant surveys are so highly-regarded as ecological indicators thatgovernments worldwide accept their results when assessing the environmentalimpact of mining and tree harvesting. 49__________Why not? Because many companies can't afford the expense or thelaboratory time needed to sift results for a comprehensive survey. The coststems, also, from the scarcity of ant specialists,50__________ A.This allowed scientists to gauge the pace and progress ofthe ecological recovery. B.Yet in other businesses, such as farming and propertydevelopment, ant surveys aren't used widely. C.Employing those people are expensivE.D.They do this by sorting the ants, counting their numbers andcomparing the results with those of earlier surveys. E.The evolution of ant species may have a strong impact on ourecosystem. F.Others will die out for lack of fooD.{TS} 46__________

未知题型 请根据以下内容回答{TSE}题： 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 completely 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) headquar-tered 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, 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 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.' {TS} 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

多项选择题 假设有一份3×9的远期利率协议，关于这份协议的说法，正确的是（　　）。