The strong, light-weight bamboo makes an excellent reinforcement for concrete.

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问题 The strong, light-weight bamboo makes an excellent reinforcement for concrete.

选项 A、replacement
B、enforcement
C、substitute
D、strengthening

答案D

解析 reinforcement“加固”:replacement“代替”;enforcement“执行”;substitute“代替”;strengthening“加强”。根据句意,此处应该是说竹子很好地加固了混凝土。reinforcement与strengthening都是“加固”的意思。故选D。
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