Often patients with ankle fractures that are stable, and thus do not

require surgery, are given follow-up x-rays because their orthopedists

are concerned about possibly having misjudged the stability of the frac-

ture. When a number of follow-up x-rays were reviewed, however, all

the fractures that had initially been judged stable were found to have

healed correctly. Therefore, it is a waste of money to order follow-up

x-rays of ankle fracture initially judged stable.

A.     Doctors who are general practitioners rather than orthopedists are

less likely than orthopedists to judge the stability of an ankle frac-

ture correctly.

B.     Many ankle injuries for which an initial x-ray is ordered are revealed

by the x-ray not to involve any fracture of the ankle.

C.     X-rays of patients of many different orthopedists working in several

hospitals were reviewed.

D.     The healing of ankle fractures that have been surgically repaired is

always checked by means of a follow-up x-ray.

E.      Orthopedists routinely order follow-up x-rays for fractures of bone

other than ankle bones

答案是C

我用了排除无关选项的方法选了C,可是不太明白C的意思，怎么support

能帮忙翻译下题目么?我题目没太看懂.尤其是第一句:

Often patients with ankle fractures that are stable, and thus do not

require surgery, are given follow-up x-rays because their orthopedists

are concerned about possibly having misjudged the stability of the frac-

ture.

这一句中的and连接什么呀?and前面的主句没有动词呀!

Often patients with ankle fractures that are stable, and thus do not

require surgery, are given follow-up x-rays because their orthopedists

are concerned about possibly having misjudged the stability of the frac-

ture. When a number of follow-up x-rays were reviewed, however, all

the fractures that had initially been judged stable were found to have

healed correctly. Therefore, it is a waste of money to order follow-up

x-rays of ankle fracture initially judged stable.

谁能帮忙解释下逻辑关系.好乱呀!尤其是第一句和后面几句的逻辑关系.

这个C的意思是说明数据具有代表性和普遍性。

只是对于A，因为牵扯到另一道题，让我很不理解。

 GWD-7-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.