2. 外语
  3. The question raised in the first paragraph is one ______. A surprising discovery made by the investigators during their visit t

The question raised in the first paragraph is one ______. A surprising discovery made by the investigators during their visit t

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问题 The question raised in the first paragraph is one ______.
A surprising discovery made by the investigators during their visit to ground zero is that ______.
选项 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
答案B
解析 选项A不是正确答案，因为文章说：…the floor framing systems in one of the adhacent buildings…remain intact．C不是文章表达内容。D在文中提到，但不是a surprising discovery。只有B是正确答案，
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