Question

The opinion of many engineers is that the architects(建筑学家)that designed the New York World Trade Center Twin Towers did a good job in designing the buildings．The buildings were safe from the hazards envisioned(预想到的)at the time．Indeed, they were designed to withstand(承受)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(点燃)of tons of aviation(航空)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 tower's beams were coated 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(坍塌)． 　　Most experts agree that the Twin Towers were very well－designed．Many also agree that the people 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 believes 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 to escape in time to survive． (1) Many engineers after September 11 believe that the Twin Towers were well－designed because ________． [　　] A． it could withstand aircraft crashing into it B． it could withstand any natural hazards such as earthquake or fire C． it had an appealing and elegant appearance until they were destroyed D． they had the miserable honor or being selected as the target of terrorist attack (2) According to the article, those who designed the tower could have done better if ________． [　　] A． the tower lasted longer after being attacked B． the tower held stable until all of the people inside managed to escape C． the tower was immune to such attacks D． they considered more about the effects of the very high temperatures on the structure (3) As we know from the 3rd paragraph, many people believe that ________． [　　] A． the attack was led by Bin Laden B． those who directed attack were better engineers than those who built the towers C． those who directed the attack know quite a lot about the towers D． the attack was made spontaneously (4) The part of the building below 90th floor ________． [　　] A． remained where they were B． cracked down because of the burning C． was hammered down by the falling upper part D． was safe after the attack (5) The author believes that the Twin towers ________． [　　] 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

Answer 1

答案：1．A;2．D;3．C;4．C;5．A;
解析：

(1)	文章第一段说明，许多工程师认为双子楼设计得很好，主要是因为它们能承受飞机的撞击．The buildings were safe from the hazards envisioned(预想到的)at the time．Indeed, they were designed to withstand(承受)the force of aircraft that might crash into them．be safe from免于；crash into撞到．
(2)	文章第一段的最后一句，当时的工程师并没有考虑高温的影响，因此作者认为设计双子楼的工程师们如果更多地考虑高温的影响并且做出相应调整的话，后果会比现在好一些．They were not, however, designed to withstand the effects of the very high temperatures generated by the ignition(点燃)of tons of aviation(航空)fuel carried by the aircraft．本句说明：双子楼在设计时并未考虑承受由飞机所携带的大量航空燃料的燃烧所引发的高温．generated by过去分词作后置定语，意为“由……引发、产生的”．
(3)	文章第三段Many also agree that the people planning the attacks were very knowledgeable and aimed the aircraft at a height that would effect the most damage．是本题的关键信息，既然恐怖袭击者能够有如此精心的策划，说明他们对双子楼非常了解．因为袭击者对双子楼的弱点了如指掌，因此选择了能产生最大破坏力的高度．knowledgeable有知识的，对……了解的；effect“产生；引起”．
(4)	文章倒数第二段说明，上层坍塌所造成的撞击力对下层产生了巨大的破坏作用．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．顶层的坍塌所造成的重力远远超过下层本来的承受力，就像一个巨大的锤子砸下．exceed超过；born是bear(承受)的过去分词．
(5)	综合分析文章第一段和最后一段，我们可以概括出作者的观点：双子楼的设计存在缺陷，并不像工程师们想像的那样坚固．But the public believes that architects will never again design a tall building without considering the effects of terrorist attacks of all potential kinds．But承接上文说明，公众的观点与设计双子楼的工程师的观点不同，他们认为再设计这样的高层建筑的时候一定要考虑潜在的恐怖袭击所造成的影响．never…without…此处用双重的否定表示肯定，意为：一定要……．