A. The first test. B. Smokers can’t do complex jobs well. C. Smokers are easily to get cancer. D. The fourth test. E.

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问题 A. The first test.     
B. Smokers can’t do complex jobs well.
C. Smokers are easily to get cancer.     
D. The fourth test.
E. Scientists decided to find out whether smoke could help to think.   
F. Non-smokers response more aquickly than smokers.
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选项

答案A

解析 第二段意为:第一个实验。
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