托福阅读句子插入题是阅读十大题型之一，几乎在每篇文章中都会出现，但是有很多同学不能很好的解答这种题型;tpo是托福阅读备考最权威的材料，所以托福小编为大家集中整理了tpo阅读中的句子插入题，供大家参考使用。本文带来的是TPO25的内容，一起来看看吧。
TPO25-1
The detailed appearance of Martian impact craters provides an important piece of information about conditions just below the planet’s surface. Martian craters are surrounded by ejecta (debris formed as a result of an impact) that looks quite different from its lunar counterparts. A comparison of the Copernicus crater on the Moon with the (fairly typical) crater Yuty on Mars demonstrates the differences. The ejecta surrounding the lunar crater is just what one would expect from an explosion ejecting a large volume of dust, soil, and boulders. ■However, the ejecta on Mars gives the distinct impression of a liquid that has splashed or flowed out of crater. ■Geologists think that this fluidized ejecta crater indicates that a layer of permafrost, or water ice, lies just a few meters under the surface. ■Explosive impacts heated and liquefied the ice, resulting in the fluid appearance of the ejecta. ■
13. Look at the four squares【■】that indicate where the following sentence could be added to the passage.
This surface feature has led to speculation about what may lie under Mars’s surface.
Where would the sentence best fit? Click on a square to add the sentence to the passage.
答案：(B)
TPO25-2
Paragraph 8:This decline can be seen clearly in the changes that affected Venetian shipping and trade. First, Venic’s intermediary functions in the Adriatic Sea, where it had dominated the business of shipping for other parties, were lost to direct trading. In the fifteenth century there was little problem recruiting sailors to row the galleys (large ships propelled by oars): guilds (business associations) were required to provide rowers, and through a draft system free citizens served compulsorily when called for. █In the early sixteenth century the shortage of rowers was not serious because the demand for galleys was limited by a move to round ships (round-hulled ships with more cargo space), with required fewer rowers. █But the shortage of crews proved to be a greater and greater problem, despite continuous appeal to Venic’s tradition of maritime greatness. █ Even though sailors’ wages doubled among the northern Italian cities from 1550 to 1590, this did not elicit an increased supply.█
13. Look at the four squares[■] that indicate where the following sentence could be added to the passage.
The increase in reward still did not attract young people to this hard life, and convicted criminals and slaves were pressed into services.
Where would the sentence best fit? Click on a square to add the sentence to the passage.
答案：(D)
TPO25-3
Paragraph 3:█The environmental conditions of freshwater habitats, unlike those of ocean habitats, are highly variable. █Water temperature can fluctuate seasonally or even daily and changing level of rainfall can lead to fluctuations in the concentration of chemical in the water or even to period in which the aquatic habitat dries up. █Ancient fresh water green algae must have evolved features that enable them to withstand extremes of temperature and periods of dryness. █These adaptations served their descendant well asthey invaded land.
13. Look at the four squares [█] that indicate where the following sentence could be added to the passage.
Scientists believe that chemical changes and a thicker exterior, among other things, may have helped ancient algae overcome the conditions in their environment.
Where would the sentence best fit? Click on a square to add the sentence to the passage.
答案：(D)
以上就是托福阅读句子插入题(25)，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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