四级听力提分技巧：异项保留原则
异项保留原则
当选项中出现有意思明显相反的两项时，那么正确答案必在此二项中出现!如果出现双重异项，那么即可判断出正确答案，异项保留原则在六级考试听力短对话中应用广泛!
典型例题：
6. A) She can’t finish her assignment, either。 B) She can’t afford a computer right now。 C) The man can use her computer。
D) The man should buy a computer right away。
例题分析：A、B异项，A项的意思是她现在有电脑，B项的意思则是她现在没有电脑。B、D异项，B是说女方无电脑，而D是说男方无电脑，男女也是一种反意关系。所以根据双重异项原则可确定正确答案为B项! 本题听力原文：
6. M: I’m frustrated. We’re supposed to do our assignment on the computer, but I have difficulty getting access to the computers in the library。
W: I understand the way you feel. I’m looking forward to the day when I can afford to get my own。
Q: What does the woman mean