Q27:

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?

1. 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.

2. There is no company that successfully competes with Ace Repairs for complex repair jobs.

3. Ace Repairs’ warranty is good on first-time jobs but does not cover rework jobs.

4. Ace Repairs does not in any way penalize mechanics who have worked on complex repair jobs that later had to be reworked.

5. There is no category of repair jobs in which Ace Repairs invariably carries out first-time jobs satisfactorily.

选A. 还是不懂.

membership到底指什么啊?和机械工lack competence又有什么关系?对A取非,这些工人membership有区别. 这怎么削弱了结论:不是因为工人缺乏竞争力的呢? 实在绕不过来了....

It means the members of the team. Basically, the same people who worked on the first-time job and the rework.

The paragraph talks about the difference between the first-time job and the rework, which is level of concentration, not level of compentency. The only relevant choice is about who worked on those jobs. If the same group of people worked on both jobs, then their level of compentency (does not change) and concentration (increased) can easily be compared.

E. Talks about repair jobs verses first-time jobs in general, whereas the paragraph focuses on the rationale for the improvements in the specific repair jobs.

简单地说，这类assumtption题目无非就是“不是...，而是..."的问题。

题目说是concentration的原因。A说first job和rework的工人没有systematic分别。否定A，就是有systematic分别，就是说是工人的不同造成，而不是concentration.

many thanks !!!!