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In 1924 America's National Research Coun

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问题 In 1924 America's National Research Council sent two engineers to supervise a series of industrial experiments at a large telephone-parts factory called the Hawthorne Plant near Chicago.It hoped they would learn how stop-floor lighting 1 workers'productivity.Instead,the studies ended 2 giving their name to the"Hawthorne effect",the extremely influential idea that the very 3 to being experimented upon changed subjects'behavior.The idea arose because of the 4 behavior of the women in the Hawthorne plant.According to 5 of the experiments,their hourly output rose when lighting was increased,but also when it was dimmed.It did not 6 what was done in the experiment;7 something was changed,productivity rose.A（n）8 that they were being experimented upon seemed to be 9 to alter workers'behavior 10 itself.After several decades,the same data were 11 to econometric the analysis.Hawthorne experiments has another surprise store 12the descriptions on record,no systematic 13 was found that levels of productivity were related to changes in lighting.It turns out that peculiar way of conducting the experiments may be have let to 14 interpretation of what happed.15,lighting was always changed on a Sunday.When work started again on Monday,output 16 rose compared with the previous Saturday and 17 to rise for the next couple of days.18,a comparison with data for weeks when there was no experimentation showed that output always went up on Monday,workers 19 to be diligent for the first few days of the week in any case,before 20 a plateau and then slackening off.This suggests that the alleged"Hawthorne effect"is hard to pin down.3选？A.truthB.sightC.actD.proof
选项 A.truth
B.sight
C.act
D.proof
答案 C
解析 分析句子结构可知，the extremely influential idea…是对“Hawthorne effect”的补充说明，可看作其同位语；idea后的that又引导同位语从句，进一步说明idea的内容。不难看出，从句的主干为the very 3 changed subject’s behavior；of being experimented upon作本题所填词的定语。根据上下文的语义可知，C为本题正确答案。本题所在的部分大意为：这个十分具有影响力的结论认为，仅仅是被试验这一行为就足以使实验客体的表现发生变化。其它三项，从语法上都能与of being experimented upon连用，但放入空中语义不通，故C为正确答案。
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