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单选题
As is used in paragraph 4, the phrase “a control group” refers to ______.
A

people working at the Oregon Department of Health

B

people investigating at the Mulmonah County Health Department in Oregon

C

people serving as a standard of comparison for checking test results

D

people involved in passing legislation banning smoking in eating establishments


参考答案

参考解析
解析:
推断题。答案来自第四段。由原文可知control group表示similar subjects in restaurants,而subject在此处的意思表示受试验者,所以C为正确选项。
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