P: However, these regions became less active several seconds 【before some errors were made,】and another brain region, 【region X, became active. 】 C: The researchers concluded that the 【monitoring of region X could provide warning of an impending 即将发生的；迫在眉睫； error.】 C: 研究人员得出结论，对X区域的监测可以为即将发生的错误提供警告。 生词：diminution n. 减少；缩减； A decreasing cognitive efforts， 无关 B brain regions with cognitive efforts，无关 结论问的说的是regions X C 其他研究表明任何错误发生前 X都会活跃。【草率结论 额外P加强结论】 D只比原文P多提供了一个5秒信息，此信息无用 【重复原文信息，无用，不要选！diminution 减少；】 E 睡觉的时候 regions with cognitive efforts 活跃，与region X 无关