2. 外语
  3. Professor James used student volunteers as ______ for his experiment.

Professor James used student volunteers as ______ for his experiment.

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问题 Professor James used student volunteers as ______ for his experiment.
选项 A、models
B、cases
C、agents
D、subjects
答案D
解析 此题考查名词词义。关键词为题干中的experiment，与此相关的应是D项subjects“受试对象”，而不会是A项的models“模特”、B项的cases“事例；病例；条例”或C项的agents“代理人”。
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