托福阅读主要涉及五大逻辑关系：因果关系、对比转折关系、比较关系、否定关系与并列递进关系。不同的逻辑关系以不同的词汇表达，这些词汇既包含关联词，像while, but(表示对比转折关系)等，也包含一些实词，如lead to (表示因果关系)。表示上述五大逻辑关系的常见词汇如下：
因：because, because of, for, as, since, in that, on account of, with(由于，随着)
果：so, so that, therefore, thereby, as a result, hence, thus, consequently, accordingly
a. 导致(因—果)：cause, reason(推断), lead to, give rise to, result in, render, make, let, ask, support, push, stimulate, spark, spur, fuel, produce, be responsible for
b. 由……而来(果—因)：result from, derive from, originate from, initiate from, stem from, be responsive to, be attributable to
c. 反映/体现(果—因)：reflect, present, demonstrate, suggest, imply, show
d. 考虑到，依赖于(果—因)：given, considering, concerning, in view of, thanks to; rely on, depend on, resort to, according to
e. 条件关系：when, once, as soon as, as long as
1. 对比：while, whereas; on the other hand, conversely, on the contrary, in contrast; unlike, different from; differ; before, prior to, after
2. 转折：but, although, despite, in spite of, nevertheless, notwithstanding, however
1. 比较级：as … as, more … than, -er than, less … than
a. 本身有最高级含义：maximum, minimum, peak, outstanding, top
b. 本身程度比较深：amazing, surprising, astonishing, prohibitively high
a. 变化：change, alter, vary, modify, revise, increase, decrease, enhance, diminish, develop, progress, advance, improve, retreat, degenerate, continue, remain
b. 差异：different, distinct, distinguish, separate, same, similar, comparable, compare … to
c. 超越：surpass, exceed, excel, over
1. 显性否定：no, not, never, nor, none, neither
2. 隐性否定：fail to, refuse, remove, miss, reject, absence of, lack of
3. 否定前缀：a-, ab-, dis-, il-, im-, in-, non-, un-
4. 双重否定：not fail to, not illegal=legal, not uncommon=common
and, furthermore, moreover, in addition, beyond that, as well as
Paragraph 3: At times, it is actually possible to watch the effects of natural selection in host-parasite relationships. For example, Australia during the 1940 s was overrun by hundreds of millions of European rabbits. The rabbits destroyed huge expanses of Australia and threatened the sheep and cattle industries. In 1950, myxoma virus, a parasite that affects rabbits, was deliberately introduced into Australia to control the rabbit population. Spread rapidly by mosquitoes, the virus devastated the rabbit population. The virus was less deadly to the offspring of surviving rabbits, however, and it caused less and less harm over the years. Apparently, genotypes (the genetic make-up of an organism) in the rabbit population were selected that were better able to resist the parasite. Meanwhile, the deadliest strains of the virus perished with their hosts as natural selection favored strains that could infect hosts but not kill them. Thus, natural selection stabilized this host-parasite relationship. (TPO 17)
The word devastated in the passage is closest in meaning to
被考词汇devastated所在句子的下一个句子中有however表示对比转折关系： The virus was less deadly to the offspring of surviving rabbits, however, and it caused less and less harm over the years，说明devastated与less deadly的意思相反，而less表示否定，那么devastated的意思相当于deadly(致命的)，与此意思接近的为第四个选项 ：“破坏”，因此它是正确选项。
Paragraph 6: With the advent of projection, the viewer's relationship with the image was no longer private, as it had been with earlier peepshow devices such as the Kinetoscope and the Mutoscope, which was a similar machine that reproduced motion by means of successive images on individual photographic cards instead of on strips of celluloid. It suddenly became public---an experience that the viewer shared with dozens, scores, and even hundreds of others. At the same time, the image that the spectator looked at expanded from the minuscule peepshow dimensions of 1 or 2 inches (in height) to the life-size proportions of 6 or 9 feet.
Which of the following is mentioned in paragraph 6 as one of the ways the Mutoscope differed from the Kinetoscope?
(A)Sound and motion were simultaneously produced in the Mutoscope.
(B)More than one person could view the images at the same time with the Mutoscope.
(C)The Mutoscope was a less sophisticated earlier prototype of the Kinetoscope.
(D)A different type of material was used to produce the images used in the Mutocope.
这是一道事实信息题，根据问题中的关键词Mutoscope和Kinetoscope定位到段落首句，问题中的differed from要求我们在文中寻找对比关系。首句中的which引导的非限定性定语从句补充说明Mutoscope和Kinetoscope的相同点和不同点，其中instead of 提示二者之间的区别，即对比关系：on individual photographic cards instead of on strips of celluloid(在卡片上而不是电影胶片上)。由此可见Mutoscope和Kinetoscope成像的材料不同。选项4符合此意，为正确答案。
Paragraph 1: It should be obvious that cetaceans-whales, porpoises, and dolphins-are mammals. They breathe through lungs, not through gills, and give birth to live young. Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land-dwelling mammals. However, unlike the cases of sea otters and pinnipeds (seals, sea lions, and walruses, whose limbs are functional both on land and at sea), it is not easy to envision what the first whales looked like. Extinct but, already fully marine cetaceans are known from the fossil record. How was the gap between a walking mammal and a swimming whale bridged? Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.
Which of the following can be inferred from paragraph 1 about early sea otters?
(A)It is not difficult to imagine what they looked like
(B)There were great numbers of them.
(C)They lived in the sea only.
(D)They did not leave many fossil remains.
问题中的infer表明这是一道推理题。根据问题中的关键词 sea otters 定位到文中第三句： However, unlike the cases of sea otters and pinnipeds (seals, sea lions, and walruses, whose limbs are functional both on land and at sea), it is not easy to envision what the first whales looked like，其中的unlike表明sea otters和first whales不同，构成对比关系，那么可以推出：不难想象sea otters早期的样子。因此选项1为正确答案。其他选项涉及的数量和栖息环境在原文中都未提到。
…The nineteenth century brought with it a burst of new discoveries and inventions that revolutionized the candle industry and made lighting available to all. In the early-to-mid-nineteenth century, a process was developed to refine tallow (fat from animals) with alkali and sulfuric acid. The result was a product called stearin. Stearin is harder and burns longer than unrefined tallow. This breakthrough meant that it was possible to make tallow candles that would not produce the usual smoke and rancid odor. Stearins were also derived from palm oils, so vegetable waxes as well as animal fats could be used to make candles…
Which of the following can be inferred from paragraph 1 about candles before the nineteenth century?
(A)They did not smoke when they were burned.
(B)They produced a pleasant odor as they burned.
(C)They were not available to all.
(D)They contained sulfuric acid.
问题中的infer表明这是一道推理题。同时，问题中的 before the nineteenth century 表明问题要求我们在原文中寻找对比关系(关于这一点，见p )。 文章第一句指出：19世纪涌现的一些新发明和发现使蜡烛业发生了一场革命，这场革命使得所有人都能用蜡烛照明。 这等于说，在19世纪蜡烛业发生革命以前，并不是所有人都能用蜡烛照明，C选项表达了此意，为正确答案。
The Psychodynamic Approach. Theorists adopting the psychodynamic approach hold that inner conflicts are crucial for understanding human behavior, including aggression. Sigmund Freud, for example, believed that aggressive impulses are inevitable reactions to the frustrations of daily life. Children normally desire to vent aggressive impulses on other people, including their parents, because even the most attentive parents cannot gratify all of their demand immediately. ■Yet children, also fearing their parents’ punishment and the loss of parental love, come to repress most aggressive impulses. ■The Freudian perspective, in a sense, sees us as “steam engines.” ■By holding in rather than venting “steam,” we set the stage for future explosions. ■Pent-up aggressive impulses demand outlet. They may be expressed 8toward parents in indirect ways such as destroying furniture, or they may be expressed toward strangers later in life.
Look at the four squares [■] that indicate where the following sentence can be added to the passage.
According to Freud, however, impulses that have been repressed continue to exist and demand expression.
Where would the sentence best fit?
待插入句中的信号词however表明这个句子与前一句成对比关系，也就是意思上发生了转折。专有名词Freud与名词词组impulses that have been repressed也是线索，就是说待插入处的前后句必须出现这两组核心词。
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