句子插入题是托福阅读十大题型之一，下面小编结合具体的例子为大家分享托福阅读句子插入题的解题步骤，大家一起来学习一下吧。
做题之前，我们首先应该了解这道题的出题意图是什么。句子插入题的考查点主要包括以下两方面：
1、考查是否理解文章内部逻辑关系。一般考查段落内部——句子之间的逻辑关系，有时也会考查段落之间的逻辑关系。
2、考查是否知道段落间重要的指示词和连词的作用。只有了解起着文章衔接作用的连词的用法，才能紧随文章逻辑。
了解了出题意图，接下来要怎么解题呢?下面我们以TPO21-Geothermal Energy中的一道题为例，来为大家讲解句子插入题的解题步骤。
Earth's internal heat, fueled by radioactivity, provides the energy for plate tectonics and continental drift, mountain building, and earthquakes. It can also be harnessed to drive electric generators and heat homes. Geothermal energy becomes available in a practical form when underground heat is transferred by water that is heated as it passes through a subsurface region of hot rocks (a heat reservoir) that may be hundreds or thousands of feet deep. ■The water is usually naturally occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface. ■The water is brought to the surface, as a liquid or steam, through holes drilled for the purpose.■
By far the most abundant form of geothermal energy occurs at the relatively low temperatures of 80° to 180° centigrade. ■Water circulated through heat reservoirs in this temperature range is able to extract enough heat to warm residential, commercial, and industrial spaces. More than 20,000 apartments in France are now heated by warm underground water drawn from a heat reservoir in a geologic structure near Paris called the Paris Basin. Iceland sits on a volcanic structure known as the Mid-Atlantic Ridge. Reykjavik, the capital of Iceland, is entirely heated by geothermal energy derived from volcanic heat.
13. Look at the four squares [■] that indicate where the following sentence could be added to the passage.
In either case, the heated water will usually be under considerable pressure, and so may have a temperature that is well above its sea-level boiling point of 100° centigrade.
Where would the sentence best fit? Click on a square to add the sentence to the passage.
做句子插入题主要依赖的是语言线索，所以：
第一步：仔细阅读待插入的句子，弄清含义，找出其中包含的衔接手段，预测可能存在的语境。也就是：In either case, the heated water will usually be under considerable pressure, and so may have a temperature that is well above its sea-level boiling point of 100 centigrade.
句子中出现“either case”, either表示两者中“或者，任一”，意味着原文必提及两种“case”。
第二步：读原文，找线索
■The water is usually occurring groundwater that seeps down along fractures in the rock; less typically, the water is artificially introduced by being pumped down from the surface. ■The water is brought to the surface, as a liquid or steam, through holes drilled for the purpose.■By far the most abundant form of geothermal energy occurs at the relative low temperature of 80 to 180° centigrade.■
我们发现原文首句提及“The water is usually occurring groundwater that seeps down along fractures in the rock;”一种情况外，还提到了“less typically, the water is artificially introduced by being pumped down from the surface”这种情况，满足了“两种case”的猜测。于是，我们把待插入句放到第二个小黑框前，检查一遍，逻辑通顺。
以上就是托福阅读句子插入题的解题步骤，希望能给考生的学习带来帮助。最后，小编祝愿各位考生在托福考试中取得好成绩!
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