2. 外语
  3. 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 a

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 a

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问题    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 test, smokers, deprived smokers and nonsmokers performed equally well.
   The next test was more complex, requiring all to scan sequences of 20 identical letters and respond the instant one of letters transformed into a different one. Nonsmokers were faster, but under the stimulation of nicotine active smokers were faster than deprived smokers.
   In the third test of short - term memory, nonsmokers made the fewest errors, but deprived smokers committed fewer errors than active smokers.
   The fourth test required people to read a passage, then answer questions about it. Nonsmokers remembered 19 percent more of the most important information than active smokers, and deprived smoker bested those who had smoked a cigarette just before testing. Active smokers tended not only to have poorer memories but also had trouble separating important information from insignificant details.
   As our tests became more complex, sums up Spilich, "nonsmokers performed better than smokers by wider and wider margins." He predicts, "smokers might perform adequately at many jobs——until they got complicated. A smoking airline pilot could fly adequately if no problems arose, but if something went wrong, smoking might damage his mental capacity."
George Spilich’s experiment was conducted in such a way as to _________.
选项 A、compel the subjects to separate major information from minor details
B、put the subjects through increasingly complex tests
C、check the effectiveness of nicotine on smokers
D、register the prompt responses of the subjects
答案B
解析 考生从四次实验内容可以推断出是以让实验逐渐复杂来进行的。且从文中“As our tests became more complex．．．”一句也可得出正确的答案。
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