一、关于多义单词
关于这类多义单词汇，因为词汇本身考生认识，但是却没有掌握全面的意思，有些生僻词汇的意思正是SAT填空所考察的，小站教育给大家举个例题：
Just as glass windows offer buildings both light and insulation, certain atmospheric gases___ incoming sunlight and___ heat radiated from the ground, preventing warmth from escaping.
A. conduct…..release
B.deflect…..transmit
C. admit…..contain
D. absorb…..dispense
E.resist…..trap
正确答案：C
考生要先通过as判断句子的逻辑关系，然后找出关键词light和insulation,对应下面__ incoming sunlight和___ heat radiated from the ground,这就不难推断出第一空格是有，第二空格没有，依此需找答案，发现选项C是符合的。这里考察的是contain的一个生僻意思，即是抑制。
而这个意思在考试中反复出现的，例如：
The attempts of epidemiologists to___ the infectious disease ultimately proved futile: as soon as they managed to___ it in one community, it would emerge somewhere else.
正确答案：contain…check
二、变义单词
变义词汇也是SAT填空题或阅读词汇题常考类型。所谓的变义单词是已知的词汇，加了ed或者ing之后单词发生了词义非常规变化，例如：
Although visitors initially may find touring the city by subway to be ______, they are pleased to discover that subways are an inexpensive and ______ way to get around.
A. wasteful generous
B. daunting efficient
C. extravagant prohibitive
D. convenient solitary
E. enjoyable easy
这道题很简单，但是很多同学没有把prohibitive的考点搞清楚，这里意思应该是“昂贵的”，与前面inexpensive成反义词，如果从逻辑判断或从叫感情色彩角度判断，考生会很快排除错误答案。
