单选题 The towers of a suspension bridge serve as a rigid framework to which the cables are attached.
  • A. boundary
  • B. skeleton
  • C. enclosure
  • D. material


【正确答案】 B
【答案解析】[解析] framework：框架、基本结构，和skeleton(骨架、骨骸)意思相近；boundary：分界线；enclosure：围绕、围墙；material：材料。