托福阅读四大逻辑关系，不可忽视重要解题技巧！
新东方托福视频教程频道小编为大家整理了托福阅读四大逻辑关系，不可忽视重要解题技巧，下面是详细内容，供大家参考。【Ctrl+D收藏，下次查看更方便】
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1. 因果关系
因：because, because of, for, as, since, in that, on account of, with
果：so, so that, therefore, thereby, as a result, hence, thus, consequently, accordingly
因果关系除了传统意义上的显性因果表达词外，隐性的因果同样是不行疏忽的一个重要部分。
隐性因果：
A.致使(因-果)：cause, reason, lead to, give rise to, result in, render, make, let, ask, support, push, stimulate, spark, spur, fuel, produce, be responsible for
如The increased pressures of expanding populations have led to the removal of woody plants so that many cities and towns are surrounded by large areas completely lacking in trees and shrubs。
在这段话中，有lead to, 表明了致使的意思，即成果； 而so that 更进一步表明了后边的成果，所以能够充沛断定这段话有因果关系的逻辑。
B.由…而来(果-因)：result from, derive from, originate from, initiate from, stem from, be responsive to, be attributable to
如 “The extreme seriousness of desertification results from the vast areas of land and tremendous numbers of people affected, as well as from the great difficulty of reversing or even slowing the process。”
在这段话中，依据result from能够推断出有因果关系，那如果是解说语句题时，选项中有因果关系就能够思考。
C.反映，表现(果-因)： reflect, present, demonstrate, suggest,
imply, show
This result demonstrates that…
D.考虑到： given, considering, in view of, thanks to, according to
He succeeded thanks to (in view of) his effort。
E.依赖于： rely on, depend on, resort to,
He resorted to books when he had problems。
F.条件关系：when, once, as soon as, as long as
As soon as he got the money, he would leave the country at once。
G.分词短语，不定式做状语
Failing in the final exam, she cried。
2. 对比转折关系
A.对比：while, whereas, on the other hand
在解释句子题，插入句子题中，一旦出现对比关系，学生在掌握的基础上就能非常的判定句间和句内的关系。While, whereas 前后连接的是平行结构，on the other hand前必定有on one hand, 可以用来把握句间关系。
B.转折：but, although, despite, in spite of, nevertheless, however
转折是托福阅读的一个经典考点之一，掌握这些转折词对考试非常有帮助。
3. 比较关系
A.同级比较：as…as
B.比较级：more…than, -er than, less…than
C.变化：change, alter, vary, modify, revise, increase, decrease, enhance, diminish, develop, progress, advance, improve, retreat, degenerate, continue, remain
D.差异：different, distinguish, separate, same, similar, comparable, compare…to
E.超越：surpass, exceed, excel, over
F.较
1)本身有较含义：maximum, minimum, peak, outstanding, top
2)本身程度比较深：amazing, surprising, astonishing, prohibitively high
3)否定+比较=较：No one is more outstanding than him。
从这句话中可以看出，否定加比较表示的是一种较关系。
4. 否定关系
A.显性否定：no, not, never, nor, none neither
B.隐形否定：fail to, refuse, remove, miss, reject, absence of, lack of
C.否定前缀：a-, ab-, dis-, il-, im-, in-, non- , un-
否定前缀是词汇题中经常出的一个考点，把握否定前缀可以帮助考生把握一些生词，依靠否定前缀对选项进行一个排除。
D.双重否定：not fail to, not illegal, not uncommon, not unavailable
双重否定是英文中经常运用的表达方式，由于在平时中文对话中用的很少，随意对双重否定的把握就显得特别的重要。
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