托福阅读修辞目的题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的修辞目的题及其对应的解析，供大家参考使用。本文带来的是TPO33-2的修辞目的题，一起来看看吧。
TPO33-2 Railroads and Commercial Agriculture in Nineteenth-Century United States
【5】As railroad linesfanned out from Chicago, farmers began to acquire open prairie land in Illinoisand then Iowa, putting the fertile, deep black soil into production. Commercialagriculture transformedthis remarkable treelessenvironment. To settlers accustomed to eastern woodlands, the thousands ofsquare miles of tall grass were an awesome sight. Indiangrass, Canada wild rye, and native big bluestem all grew higher than a person.Because eastern plows could not penetrate the densely tangled roots of prairiegrass, the earliest settlers erected farmsalong the boundary separating the forest from the prairie. In 1837, however,John Deere patented a sharp-cutting steel plow that sliced through the sodwithout soil sticking to the blade. Cyrus McCormick refined a mechanical reaperthat harvested fourteen times more wheat with the same amount of labor. By the1850s McCormick was selling 1,000 reapers a year and could not keep up withdemand, while Deere turned out 10,000 plows annually.
9. Why does author point out that “Indian grass, Canada wild rye, andnative big bluestem all grew higher than a person”?
A) To provide a reason why people from the eastern woodlands of the United States were impressed when they saw the prairie
B) To identify an obstacles to the development of the railroad linesfanning out from Chicago
C) To explain why the transformation of the prairies by commercialagriculture was so remarkable
D) To provide evidence supporting the claim that the prairies had fertile,deep black soil
答案：D
解析：定位句As railroad linesfanned out from Chicago, farmers began to acquire open prairie land in Illinois and then lowa, putting thefertile, deep black soil into production. 该段的主旨: 农民将肥沃的黑土投入生产中, 提干中的信息是一个具体的例子, 表明的是具体的产物。
段落翻译：
当铁路线路从芝加哥呈扇形延伸开来，农民们开始获得伊利诺伊州的广阔草原地带，然后获得了洛瓦的大片草原，将这肥沃深袤的黑土地用于生产。商业化的农业将这些令人瞩目的不毛之地进行了转型。对于那些习惯了东部树木葱郁的环境的定居者来说，一望无际的高高生长的野草是一种壮观的风景。印度草，加拿大野黑麦，当地的大须芒草都长得比人还高。因为东部的犁进不了浓密的纠结的草原牧草的根须中，最早的定居者就在森林和草原的边缘建立了农场。不过1837年，JohnDeere申请了专利，是一个有锋利的切割刀片的犁，可以切入草皮而不会有泥土粘在刀片上。CyrusMcCormic改进了一个机械的收割机，是人力收割量的十四倍。十九世纪五十年代McCormick每年卖1000台收割机，还不能满足需求，同时Deere每年生产一万台犁。
以上就是托福阅读TPO33-2中的修辞目的题及其解析，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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