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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