2. 外语
  3. The towers of a suspension bridge serve as a rigid framework to which the cables are attached.

The towers of a suspension bridge serve as a rigid framework to which the cables are attached.

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问题 The towers of a suspension bridge serve as a rigid framework to which the cables are attached.
选项 A、boundary
B、skeleton
C、enclosure
D、material
答案B
解析 framework：框架，基本结构。skeleton：骨架，框架。His constructions are centered around steel skeletons. 他的建筑以钢骨架为中心。boundary：分界线。territorial boundaries：领土边界。enclosure：围绕，围墙。material：材料。
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