六遥词汇笔记单选题词汇解析7　　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 低件 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 遥 　　B.
dispersed 散开 消散 　　C.
dissipated 消散 消失 　　D.
drained 耗尽 　　解析： 　　finally 较终 　　dominish 消失减少 (同义：smother eliminate) 　　shrink 缩水