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第四招：概括、抽象保留原則
當選項中出現比較概括、抽象的句子時，這時我們就要把表述事實的、具體的句子劃掉，而去選擇表概、抽象、比較性的句子！此原則可衍生出一個包含取大的原則，在作題時應用也是十分的廣泛，一般當兩個選項的意思接近時，表述比較全面的一般為正確選項！
典型例題：
7. A) The visiting economist has given several lectures.
B) The guest lecturer’s opinion is different from Dr. Johnson’s.
C) Dr. Johnson and the guest speaker were schoolmates.
D) Dr. Johnson invited the economist to visit their college
例題分析：A、C、D均為表述事實的句子，只有B項為對比、比較的句子，較之A、C、D項更為抽象的表述了一件事情，所以B項為正確選項！
本題聽力原文：
7. M: The visiting economist is speaking tonight, but Dr. Johnson doesn\'t seem to think much of him.
W: That\'s because Dr. Johnson comes from an entirely different school of thought.
Q: What do we learn from the woman\'s remark?
