我是刚接触GRE的新手
最近开始练习逻辑题目
但是做了十题只对一题
非常沮丧
请问大家是如何练习逻辑的呢?
能否用下面两题示范一下大家的逻辑思维
　1. Editorial:
　　About 20 percent of professors at Torellia National University were not
educated in Torellia. The average pay of professors at the university who
were educated in Torellia is about 10 percent lower than that of professors
with comparable levels of training and experience who were educated outside
Torellia. These figures clearly indicate the existence of a university
policy, though probably an unwritten one, of favoring foreign-educated
professors over those educated in Torellia when determining salaries
Which of the following, if true,most seriously undermines the editorial's
conclusion ?
　　(A) The salaries of professors at the university are increasing more
slowly than the salaries of people with comparable levels of training and
experience employed by corporations.
　　(B) The business school of the university, where most of the professors
who were educated outside Torellia teach, must pay high salaries to its
faculty to compete with salaries available to them from corporations.
　　(C )The benefits other than salary offered to the university’s
professors are about the same for professors educated in Torellia as for
those not educated in Torellia.
　　(D) The university has an explicit policy setting broad salary ranges for
professors at all levels of experience.
　　(E )Most of the professors at the university who were educated outside
Torellia are native-born citizens of Torellia.
这题我觉得五个选项都无法破坏社论的结论
请问为什么答案是B