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The opinion of many engineers is that the architects that designed tine New

游客2024-02-18  68
问题     The opinion of many engineers is that the architects that designed tine New York World Trade Center Twin Towers did a good job in designing the buildings. The buildings were safe from the hazards envisioned at the time. Indeed, they were designed to withstand the force of aircraft that might crash into them. They were not, however, designed to withstand the effects of the very high temperatures generated by the ignition of tons of aviation fuel carried by the aircraft.
    Steel lightly covered with concrete is the main structural component of the towers and steel loses a lot of structural strength when heated to 1,100 degrees Centigrade and beyond, as it was. To shield the steel the towers beams(柱梁) were c0ated with a few centimeters of concrete. That insulation was to provide structural integrity for at least 1 hour of fire. The towers met that test. The south tower lasted 62 minutes. The north, 103 minutes. Tragedy followed when not all could escape prior to the collapse.
    Most experts agree that the Twin Towers were very. well designed. Many also agree that the pan pie planning the attacks were very knowledgeable and aimed the aircraft at a height that would effect the most damage. The aircraft crash and the resulting fuel fed fires were aimed at about the 90th floor. That was just high enough to insure that the upper floors would weaken with the heat and crack down, dropping into the remaining part of the building.      The mass of the falling top floors created such a falling load that some experts estimate it exceeded by 5 to 10 times normal bearing loads. The effect was like a giant hammer, each floor contributing more weight to be born by the next floor down.
    Were the Trade Towers well designed? Engineers say yes. But, the public refers to the belief that architects will never again design a tall building without considering the effects of terrorist attacks of all potential kinds. That not only includes the ability of the structure to withstand attack but the means to allow the buildings occupants(居住者) to escape in time to survive. [br] The author believes that the Twin towers ______.
选项 A、were not well-designed
B、were well-designed
C、were good examples for engineers of our time
D、were out of consideration when we talk about engineering later
答案 A
解析 纵观全文，在第一段首句，作者提到The opinion of many engineers is that the architects…did a good job in designing the buildings.，即许多工程师认为世贸大厦建筑设计得很好，在第三段中作者再次提到 Most experts agree that the Twin Towers were very well designed.，即许多专家认为世贸大厦设计得很好。但是这两句都没有表明作者的态度。在文章最后一段，作者再次提问：世贸大厦果真设计得很好吗?而后回答“工程师们说是的”，但我们感到一种言外之意。紧接着作者说But，the public refers to the belief that architects will never again design a tall building without considering the effects of terrorist attacks of all potential kinds.，即“然而，大众却认为设计者再设计高楼大厦时，一定要全面考虑到恐怖袭击中会出现的所有可能性。”言外之意，世贸大厦当初的设计没有全面考虑到受恐怖袭击会遇到的所有问题。由此可见，作者认为世贸大厦的设计并不好。这正是A)的含义。B)、C)是对文中人物的观点和作者的观点混为一谈的结果，故排除；而D)文中未提到，应排除。
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