47. Fiber-optic cables can carry hundreds of telephone conversations ______.
　　A) simultaneously
　　B) spontaneously
　　C) homogeneously
　　D) contemporarily
　　注：三剑客词汇：simultaneously，spontaneously，contemporarily
　　48. The police were alerted that the escaped criminal might be in the ______.
　　A) vain
　　B) vicinity
　　C) court
　　D) jail
　　注：vicinity 附近，邻近
　　49. Whether you live to eat or eat to live, food is a major ______ in every family’s budget.
　　A) nutrition
　　B) expenditure
　　C) routine
　　D) provision
　　注：1. expenditure 花费 2. budget 预算（六级）
　　50. Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth rather than bacteria on Mars.
　　A) configuration
　　B) constitution
　　C) condemnation
　　D) contamination
　　注：2道理科题；2道文科题；1道环保题。
　　51. There is much I enjoy about the changing seasons, but my favorite time is the ______ from fall to winter.
　　A) transmission
　　B) transformation
　　C) transition
　　D) transfer
　　注：1. transmission 广播电视节目的传送；疾病的传播；文化的传递
　　2. transformation 变革
　　3. transition 季节的过度，时间的更替，社会制度的转型
　　4. transfer 转学，调任工作
　　52. I think we need to see an investment ______ before we make an expensive mistake.
　　A) guide
　　B) entrepreneur
　　C) consultant
　　D) assessor
　　注：consultant 顾问
　　53. The ______ on this apartment expires in a year’s time.
　　A) treaty
　　B) lease
　　C) engagement
　　D) subsidy
　　注：lease 租约
　　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）