The Fall of World Trade Centre
Ⅰ. Flashback of the disaster
A. The twin towers of the World Trade Center collapsed
B. A relative success in terms of
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- the buildings performed "magnificently"
- the towers stayed standing for about
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each
Ⅱ. An extraordinary design
A.
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skyscrapers
-
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throughout a building
- diagonal beams as their means of support
B. twin towers
- designed and built with special attention to
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-
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hurricane-force winds of up to 200 mph
- sway up to several feet
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- the secret of its build-up:
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- supporting steel column
- majority of the beams framed the outside walls—a solid "
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" design
- smaller group of steel beams shot
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of the buildings and bore
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of supporting the towers
Ⅲ. The fundamental cause of its collapse:
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A. the high temperature failed
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and weakened the insulation around the steel
B. the heat
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C. top-floor fell and hence the demolition
Ⅳ. Collapse: a controlled demolition, like a
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【参考答案】
warped the steel[解析] 细节题。根据讲座原文“With flames reaching tempera......