All railroads have weight and height________, because of tunnels, bridges and so forth.

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问题 All railroads have weight and height________, because of tunnels, bridges and so forth.

选项 A、boundaries
B、restraints
C、confinement
D、limitations

答案D

解析 由于有隧道、桥梁等结构,所有的铁路都有通行重量和高度的限制。A项boundary“分界线,边界,界限”。B项restraint“抑制,克制;约束措施,约束条件”。C项confinement “关押;禁闭;监禁”。D项limitation“限制,限度”。
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