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摸底：Unit 8（二） 54. The elderly Russians find it hard to live on their state ______. A) pensions B) earnings C) salaries D) donations 注：pensions 养老金 55. There is supposed to be a safety ______ which makes it impossible for trains to collide. A) appliance B) accessory C) machine D) mechanism 56. After four years in the same job his enthusiasm finally ______. A) deteriorated B) dispersed C) dissipated D) drained 注：1. drain （强调结果）耗尽 2. disperse （强调过程） 3. dissipate （强调过程） 57. No one can function properly if they are _______ of adequate sleep. | 
