我是剛接觸GRE的新手
最近開始練習邏輯題目
但是做了十題只對一題
非常沮喪
請問大家是如何練習邏輯的呢?
能否用下面兩題示範一下大家的邏輯思維
　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.
這題我覺得五個選項都無法破壞社論的結論
請問為什麼答案是B