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比较级在雅思阅读里面考察很多，常考题型涉及matching sentence endings，True/False/Not given，Yes/No/Not given，matching features.
比较级是一种特殊的语法结构，拥有than这个标志性的特征，除此之外，还有比较的结果——more+adj或者adj-er，以及比较的双方，通常是对比的名词，比如high-pitched noise 和low-pitched noise。
题目中出现的比较级并不一定意味着原文也是一定以比较级形式重现，也有其他的情况。环球教育邵飞鸿老师分析如下：
1.比较级 特殊语法结构重现，比较双方被同义替换或者原词重现
In experiments，rats who ate what they wanted led shorter lives than rats on a low-caloric diet.
They found that rats fed a low-caloric diet lived longer on average than free-feeding rats
TEXT：A is more than B.
Question：
B is more than A.
A is less than B.
B is less than A.
2.比较级=V.动词（上升和下降）
Those who felt in control in their lives pumped out lower levels of stress hormones.
Feelings of control over life can reduce stress in difficult situation.
People who felt emotionally isolated maintained higher levels of stress hormones
Feelings of loneliness may cause rises in levels of stress hormones
Higher/ larger/ greater/ more= increase/ rise/ soar
Lower/ smaller/ less= decrease/ decline/ drop/ fall/ reduce
3.比较级=N.名词（改变，不同）
Passage：Children (who were moved to less noisy classrooms) still showed greater distractibility one year later than students who had...
Question：Long-term exposure to noise can produce changes in behavior which can still be observed a year later.
Question：Students in a suggestopedia class retain more new vocabulary than those in ordinary classes.
Passage：Another difference from conventional teaching is the evidence that...
比较级= change/ difference etc.
4.比较级=否定
Computers are better than humans at detecting faults in glass.
Inspection technology allows more than...， locating flaws the unaided eye would be unable to see.
5.比较级=其他比较词组
The concept of sufficiency was more important than the concept of quantity.
Their considerations would have been more of the kind Is this enough？ rather than How many？
