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托福阅读：逻辑推断题应该这样解答
托福阅读中的推断题要做好并非易事，通过判断句子的因果关系来解题是不错的选择。下面小编会带大家看一看托福阅读推断题使用因果关系解题的技巧，结合实例让大家学习其中奥秘。
托福阅读：逻辑推断题应该这样解答
托福阅读因果关系词介绍
托福阅读中的因果关系词其实有两类，一个是表示原因的：as、since、thanks to、as result of、because of、owing to、result from、due to、on account of、by virtue of、in that、attribute to;另一个是表示结果的：as a consequence、thus、hence、so、as a result、result in、contribute to、lead to、cause、breed、trigger.
托福阅读推断题如何用因果关系来解题？
Paragraph 4: So, in another set of experiments, Kramer put identical food boxes around the cage, with food in only one of the boxes. The boxes were stationary, and the one containing food was always at the same point of the compass. However, its position with respect to the surroundings could be changed by revolving either the inner cage containing the birds or the outer walls, which served as the background. As long as the birds could see the Sun,no matter how their surroundings were altered, they went directly to the correct food box. Whether the box appeared in front of the right wall or the left wall, they showed no signs of confusion. On overcast days, however, the birds were disoriented and had trouble locating their food box.
Which of the following can be inferred from paragraph 4 about Kramer’s reason for filling one food box and leaving the rest empty?
A He believed the birds would eat food from only one box.
B He wanted to see whether the Sun alone controlled the birds' ability to navigate toward the box with food.
C He thought that if all the boxes contained food, this would distract the birds from following their migratory route.
D He needed to test whether the birds preferred having the food atany particular point of the compass.
首先，我们来明确一下推断的定义(infer, imply, indicate)，纵使它是推断题，也不是意味着这题是主观臆断，臆想或是联想得出的。这道题也是要通过提取题干中的关键词到文章中的明确位置，然后文中没有平铺直叙地告诉你答案，需要我们根据一些线索找到答案。
接下来我们来看一下这道题，题干中出现Kramer, filling one food box and leaving the rest empty定位在第四段第1句：with food in only one of the boxes，而解开这道题的重点就在于：reason。我们看到第1句话一开始说到，so, in another set of experiments，很明显，答案并不在这一段，而是上一段的最后。所以答案是B。
以上就是托福阅读中推断题用因果关系来解题的具体方法，希望大家能够通过本文内容学到高效解题技巧提升自身的实战能力。
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托福阅读遇到说明文要怎么理解?
托福阅读中的说明文题目一般难度较高，下面小编通过实例给大家讲讲说明文的解题思路。
托福阅读遇到说明文要怎么理解?
托福阅读说明文结构讲解
一般而言，托福阅读中的说明文会说明某个现象，文章的第1段是：介绍背景及引出下文;之后的主体段，结构也很清晰：主旨句Topic sentence + 解释句Explain + 举例子Examples + 总结句Summary。其实跟我们高考语文有异曲同工之妙。下面来看实例解析：
官方真题Official-19 The Roman Army's Impact on Britain
In the wake of the Roman Empire's conquest of Britain in the first century A.D., a large number of troops stayed in the new province, and these troops had a considerable impact on Britain with their camps, fortifications, and participation in the local economy. Assessing the impact of the army on the civilian population starts from the realization that the soldiers were always unevenly distributed across the country. Areas rapidly incorporated into the empire were not long affected by the military. Where the army remained stationed, its presence was much more influential. The imposition of a military base involved the requisition of native lands for both the fort and the territory needed to feed and exercise the soldiers' animals. The imposition of military rule also robbed local leaders of opportunities to participate in local government, so social development was stunted and the seeds of disaffection sown. This then meant that the military had to remain to suppress rebellion and organize government.
留下 these troops had a considerable impact on Britain;也就是第1句说的是罗马军队对英国有影响。这句话相当于对题目的阐述，交代了文章的整个大背景。之后2～4句其实交代前提，开始具体的说开，要估算军队对平民的影响首先要了解一个事实：士兵不是平均分布的。那既然不是平均分布，肯定是有多有少的。所以，第三句接着说了有些地方士兵少：很快融入帝国的区域;第四句说有些地方士兵多影响大：军队驻扎的地方。第5～7句说回重点，也就是what，到底有哪些影响：军营先要征地;然后会抢走当地领导参与单位的机会;之后社会发展受阻，人民不满而反抗，最后军事镇压。
首段的第1句话，虽然句子很长，但其实只需要抓住结构层次进行分析就能找到阅读重点。
所以总共7句话的段落，分层三个层次，主旨句+前提说明+重点阐述。事实上，段落第1句就完成了background+introduction双重目的：英国被罗马帝国征服+ 士兵的营地/防御工事以及参与当地经济所造成的影响。
Economic exchange was clearly very important as the Roman army brought with it very substantial spending power. …… Such activities had a major effect on the local area, in particular with the construction of infrastructure such as roads, which improved access to remote areas.
第二段一开始就交代了经济交换的影响：强大的购买力，以及帮助修建基础设施。
Each soldier received his pay, but in regions without a developed economy there was initially little on which it could be spent. …… These settlements acted like small towns, becoming centers for the artisan and trading populations.
第三段还是在讲经济：刚来的时候士兵有钱没地方花;最后军队驻扎地变成了小镇。
The army also provided a mean of personal advancement for auxiliary soldiers recruited from the native peoples, as a man obtained hereditary Roman citizenship on retirement after service in an auxiliary regiment. …… By the later Roman period, frontier garrisons (groups of soldiers) were only rarely transferred, service in units became effectively hereditary, and forts were no longer populated or maintained at full strength.
第四段开始讲另一个重大影响：当地人通过当兵获得可继承的罗马公民地位。
This process of settling in as a community over several generations, combined with local recruitment, presumably accounts for the apparent stability of the British northern frontier in the later Roman period. It also explains why some of the forts continued in occupation long after Rome ceased to have any formal authority in Britain, at the beginning of the fifth century A.D. The circumstances that had allowed natives to become Romanized also led the self-sustaining military community of the frontier area to become effectively British.
第五段，做了个小总结，讲这种融合过程及当地招募促进了北部边境的稳定。
通过上文实例讲解，相信大家对于托福阅读说明文的基本结构和解题思路也有了一定了解。
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