单项选择题
A. Students. B. Student and supervisor. C. Coworkers. D. Husband and wife.
A. The man is seriously ill with a cold. B. The doctor doesn’ t take the man’ s disease seriously. C. The man is going to have a few days off. D. The man hopes to get more effective medicine from the doctor.
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