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）
57. No one can function properly if they are _______ of adequate sleep.
A) deprived
B) ripped
C) stripped
D) contrived
注：deprive of 剥夺（六级最爱）
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 压制 2. curse 诅咒
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