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55.There is supposed to be a safety ___________ which makes it impossible for trains to collide. A.appliance 机械 装置 B.accessory 附件 零件 配件 C.machine D.mechanism 56.After four years in the same job his enthusiasm finally _______ . A.deteriorated 恶化 变化=degenerate 变坏 堕落 B.dispersed 散开 消散 C.dissipated 消散 消失 D.drained 耗尽 解析： finally 最终 dominish 消失减少 (同义：smother eliminate) shrink 缩水 | 
