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Questions 21 to 25 are based on the following passage: Psychologist George Spilich and colleagues at Washington College in Chestertown, Maryland, decided to find out whether as many smokers say, smoking helps them to think and concentrate. Spilich put young non-smokers, active smokers and smokers deprived of cigarettes through a series of tests. 注：1.concentrate 集中注意力 2.第一段交待实验对象，实验目的 In the first test, each subject sat before a computer screen and pressed a key as soon as he or she recognized a target letter among a grouping of 96. In this simple tests smokers, deprived smokers and non-smokers performed equally well. 注：第一句实验过程即细节，应该速读，第二句实验结果 The next test was more complex, requiring all to scan sequences of 20 identical letters and respond the instant one of the letters transformed into a different one. Non-smokers were faster, but under the stimulation of nicotine , active smokers were faster than deprived smokers. 注：1.第一句实验细节 2.stimulation 刺激 In the third test of short-term memory, non-smokers made the fewest errors, but deprived smokers committed fewer errors than active smokers. 注：committe=do (坏事) commite a crime The fourth test required people to read a passage, | 
