练习说明：
周一到周五是16个单词 + 一段翻译（单词做到认识就好，快速记忆多次重复。翻译关注紫色部分的表达，可以进行互译检测：看到中文回忆英文，看到英文回忆中文）
周六真题及其详解，再次巩固词汇体会完形题目
周日文章结构图，可以对照之前的翻译练习再次巩固
前期大家可以多关注单词。
Twenty-seven students were told which pens were electrified; another twenty-seven were told only that some were electrified. When left alone in the room, the students who did not know which ones would shock them clicked more pens and incurred more shocks than the students who knew what would happen. Subsequent experiments reproduced this effect with other stimuli, such as the sound of fingernails on a chalkboard and photographs of disgusting insects.
句子分析：
When left alone in the room, the students who did not know which ones would shock them clicked more pens and incurred more shocks than the students who knew what would happen.
主句主干：The students clicked more pens and incurred more shocks.
从句1：who引导定语从句，说明是什么样的students
从句2：which引导宾语从句，做know的宾语
more A than B 跟B比起来A更多
leave alone独处；不管，不理会
