B. introduce a solution to the issue of water shortage

　　C. explain the way in which desalination develops

　　D. exemplify the different ways to solve the problem .

　　53. Barry Nelson became a supporter of desalination owing to its___________________.

　　A. universal support among environmentalists B. contribution to natural resources C. low cost and little damage to environment

　　D. advantage to natural defense

　　54. Nelsons attitude towards desalination programs can best be described as one of ______.

　　A. qualified approval B. unreserved support

　　C. slight indifference D. absolute pessimism

　　55. The expression reverse osmosis most probably refers to ______________.

　　A. costal disruption B. technology

　　C. anti-terrorism policies D. desalination

　　Passage 4

　　We can learn a good deal about the nature of business by comparing it with poker. While both have a large element of chance, in the long run the winner is the man who plays with steady skill. In both games ultimate victory requires intimate knowledge of the rules, insight into the psychology of the other players, self-confidence, a considerable amount of self-discipline, and the ability to respond swiftly and effectively to opportunities provided by chance.

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