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7. A recent survey showed that many workers in a certain company are dissatisfied with their jobs. The survey also showed that most of the dissatisfied workers believe that they have little control over their job assignments. Therefore, to increase workers job satisfaction the company’s management need only concentrate on changing workers’ beliefs regarding the degree of control they have over their job assignments.

Which one of the following, if also shown by the survey, would most seriously call into question the conclusion made by the author of the passage?

(A) The dissatisfied workers feel that their wages are too low and working conditions are unsatisfactory.

(B) The number of workers in the company who are satisfied with their jobs is greater than the number who are dissatisfied.

(C) The workers in the company are more dissatisfied than workers in other companies

(D) Most people in company management believe that the workers already have too much control over their work.

(E) The workers in the company who are satisfied with their jobs believe that they have a lot of control over their job assignments.

这道题，我看到therefore后面的，就毫不犹豫地把它写成 increase workers job satisfaction --> changing workers’ beliefs (即：high control)

所以就认为，削弱它的话，就是 A--> neg B，但是没找到答案，随便选了一个就选错了。看正确答案选A，才知道这应该属于因果关系的削弱，可是我怎么才能知道原文是因果，而不是条件推理呢？

请NN指点。多谢！

我也不清楚怎么区分因果和条件

但这个题很明显地把dissatification的原因认为是little control，因此说给与他们belief of control就能解决satisfied的问题，但事实上satisfied和control未必有因果关系，也许只是共生（七宗罪）。

A给出了dissatisfied的真正原因。

但我认为D也可以削弱原文，不过仔细一看就发现D很狡猾，因为D说most people in company management这其实是一个小样本，因为管理层就几个人，代表不了真理。

这里的因果关系是：

因为most of the dissatisfied workers believe that they have little control over their job assignments， 所以the company’s management need only concentrate on changing workers’ beliefs regarding the degree of control they have over their job assignments。

注意这个词，A答案的削弱针对的是它。workers不满意的原因不止little control over their job assignments，A答案给出了其他不满意的原因such as low wages and undisfactory working condition.