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单选

The purpose of the experiment at the University of Vienna was to ______.

  • A.show dogs’ response to rewards
  • B.test dogs’ sense of cooperation
  • C.demonstrate dogs’ emotion of envy
  • D.measure dogs’ refusal of commands
试题出自试卷《综合英语(二)2011年10月真题试题及答案解析(00795)》
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