In the country of Veltria, the past two years' broad economic recession has included a business downturn in the clothing trade, where sales are down by about 7 percent as compared to two years ago. Clothing wholesalers have found, however, that the proportion of credit extended to retailers that was paid off on time fell sharply in the first year of the recession but returned to its prerecession level in the second year. Which of the following, if true, most helps to explain the change between the first and the second year of the recession in the proportion of credit not paid off on time? (A) The total amount of credit extended to retailers by clothing wholesalers increased between the first year of the recession and the second year. (B) Between the first and second years of the recession, clothing retailers in Veltria saw many of their costs, rent and utilities in particular, increase. (C) Of the considerable number of clothing retailers in Veltria who were having financial difficulties before the start of the recession, virtually all were forced to go out of business during its first year. (D) Clothing retailers in Veltria attempted to stimulate sales in the second year of the recession by discounting merchandise. (E) Relatively recession-proof segments of the clothing trade, such as work clothes, did not suffer any decrease in sales during the first year of the recession. 这道题错选了A。 思路如下： 题目问的是为什么在经济不好，衣服卖不动的情况下，第一年零售商还不上钱第二年就能还上了。讲的是零售商还钱的问题。 当时留下的是A,C,D 排除D是因为觉得，即使刺激销售量衣服打折也不能说明能还上钱。可能打折卖1块，纵使家当全卖了也不够。 排除C是因为觉得， 那些本身经济状况就很差的在第一年被淘汰掉以后，剩下的那些没说经济状况如何啊，如果也不咋地，第二年还是得淘汰啊。 A选项当时觉得，即使credit extended，对pay off on time也无太大用处，但最起码跟原文意思接近。所以选了A。

请教may老师这道题的思路

老师，逻辑200题这个题，我觉得B是抬扛呀，原文说这个有关系，这个B选项说没关系，这不也是抬扛的一种吗。我选的A，是因为我觉得我当时设想的答案可以就是cliche在这个环境中是没啥作用的，不会影响elect的最终成功与否，这个A选项我觉得就是表达了我这个意思

老师，这是逻辑200题里面的，您在视频课里讲到的一点，这个less cooperative得有比较，也就是看钱和不看钱的得有比较，原文只有看钱的，没说不看钱的，我非常同意，我当时也是这么想的，所以选择了C

例题9， 间接法-4C1* 6C1 是指4对夫妻中的一对，是二个人. 6C1指6人中的1人， 一对夫妻* 1人，单位数量不对，可以相乘？

例17，如何知道剩下6人不符合电脑系，剩下8人不符合数学系？如何知道是哪些人不符合2个部门？假如题目写if none of the rest of candidates 会表意精确些？

例16， 假如数字变大，选出50本，不可能手算的，我的解题思路看右边， 4C1*6C1* 8C3， 为什么不能这么算？

例题16, 因为要求value of K. 1) 怎么变成条件到结论的推导, sufficient or insufficient? 2) 单看条件2，7平方不是K因子. 怎么会条件2成立？ 因为有6 factors.

例题17 好不清楚的点是 2n= a*b*c*d, 1)为什么要假设质因数(prime factor)里面是否有2.因为本来就是2n，而且条件1提到4个不同的质因数. 2)题目是求确切值？还是说sufficient or insufficient ? 问how many

请问这道题该怎么判断

请问这道题D选项和E选项应该怎么判断？