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道理科題；2道文科題；1道環保題。
　　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 廣播電視節目的傳送；疾病的傳播；文化的傳遞
　　2. transformation 變革
　　3. transition 季節的過度，時間的更替，社會制度的轉型
　　4. transfer 轉學，調任工作
　　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 顧問
　　53. The ______ on this apartment expires in a year's time.
　　A) treaty
　　B) lease
　　C) engagement
　　D) subsidy
　　注：lease 租約
　　54. The elderly Russians find it hard to live on their state ______.
　　A) pensions
　　B) earnings
　　C) salaries
　　D) donations
　　注：pensions 養老金
　　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 （強調結果）耗盡
　　2. disperse （強調過程）
　　3. dissipate （強調過程）
　　57. No one can function properly if they are _______ of adequate sleep.
　　A) deprived
　　B) ripped
　　C) stripped
　　D) contrived
　　注：deprive of 剝奪（六級最愛）
　　58. For years now, the people of that faraway country have been cruelly ______ by a dictator.
　　A) depressed
　　B) immersed
　　C) oppressed
　　D) cursed
　　注：1. oppress 壓制 2. curse 詛咒