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第二招：異項保留原則
當選項中出現有意思明顯相反的兩項時，那么正確答案必在此二項中出現！如果出現雙重異項，那么即可判斷出正確答案，異項保留原則在六級考試聽力短對話中應用廣泛！
典型例題： 1999年12月第6題
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.
例題分析：B、C異項，B項的意思是她現在有電腦，C項的意思則是她現在沒有電腦。B、D異項，B是說女方無電腦，而D是說男方無電腦，男女也是一種反意關系。所以根據雙重異項原則可確定正確答案為B項！
本題聽力原文：
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?
