“As our tests became more difficult，” says Spilich, “non－smokers performed better than smokers by far.” he says, “Smokers might perform adequately(准确)at many jobs until they got very difficult. A smoking airline pilot could fly adequately if no problems arose, but if something went wrong, smoking might damage his mental capacity(思维能力)．”

　　1. Smokers usually think that smoking ________.

　　A. helps them to be less nervous

　　B. helps them to do better work

　　C. helps them to think and act quickly

　　D. does some good to their health

　　2. George Spilich's experiment was organized in such a way as to ________.

　　A. force the subjects to separate major information from minor details

　　B. check the effectiveness of nicotine on smokers

　　C. put the subjects through increasing difficult test

　　D. make a written and formal record of the answers of the subjects

　　3. Which fact does this passage lead us to believe?

　　A. Active smokers generally performed better than deprived smokers.

　　B. Active smokers answered more quickly than the other subjects.

　　C. Deprived smokers gave the slowest answers to the various tasks.

　　D. Non－smokers were not better than other subjects in performing simple tasks.

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