My friends love to ___________ with his friends and talk. They are not very active people.
A. shop
B. often
C. hang out
D. dance
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Football is purely a _________ sport for millions of people all around the world.
A. spectator
B. audience
C. viewer
D. watcher
Yesterday Marvin __________ TV for six hours as he was ill in bed.
A. saw
B. watched
C. looked
D. viewed
Lots of young people listen to _________ even in the street or on the bus.
A. their friends
B. their parents
C. TV
D. music
评价某诊断试验诊断某病的价值时，应要求研究对象为（）
A. 一组被金标准确诊的该病患者和一组被金标准排除该病的健康人
B. 一组被金标准确诊的该病患者和一组被金标准排除该病而且未患能影响试验结果的疾病的人
C. 一组被金标准确诊的该病患者和一组被金标准排除该病的其他疾病患者
D. 一组被金标准确诊的该病患者
E. 到医院就诊的患者
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