4.有一道黑脸题：（这道题目我肯定在哪里看到过的，但是整理稿里没有） 讲返修率的，黑体部分是“返修是员工的技能没有改变”以及“返修能修好主要是态度认真了”。 找到疑似原题了，这套题目原来是是find the assumption的，答案是A：今天做题的时候，选项A的内容在题干内，而且是黑体。 A significant number of complex repair jobs carried out by Ace Repairs have to be reworked under the company’s warranty. The reworked jobs are invariably satisfactory. When initial repairs are inadequate, therefore, it is not because the mechanics lack competence; rather, there is clearly a level of focused concentration that complex repairs require that is elicited more reliably by rework jobs than by first-time jobs.
The argument above assumes which of the following? A. There is no systematic difference in membership between the group of mechanics who do first-time jobs and the group of those who do rework jobs.