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TPO23-1的修辞目的题，一起来看看吧。
TPO23-1 Urban Climates
Paragraph 3
The burning of fuel, such as by cars, is not the only source of this increased heat. Two other factors contribute to the higher overall temperature in cities. The first is the heat capacity of the materials that constitute the city, which is typically dominated by concrete and asphalt. During the day, heat from the Sun can be conducted into these materials and stored—to be released at night. But in the countryside materials have a significantly lower heat capacity because a vegetative blanket prevents heat from easily flowing into and out of the ground. The second factor is that radiant heat coming into the city from the Sun is trapped in two ways: (1) by a continuing series of reflection among the numerous vertical surfaces that buildings present and (2) by the dust dome, the cloudlike layer of polluted air that most cities produce. Shortwave radiation from the Sun passes through the pollution dome more easily than outgoing longwave radiation does; the latter is absorbed by the gaseous pollutants of the dome and reradiated back to the urban surface.
5. According to paragraph 3, why do materials in the countryside have a lower heat capacity than materials in cities do?
A. In the countryside in the Sun is the only important source of heat.
B. Construction materials in the city are not as good at keeping buildings warm as they are in the countryside.
C. In the countryside the solar heat that flows into the ground flows out again quickly.
D. Countryside vegetation prevents heat from being trapped in the ground.
解析：revise修改，所以正确答案是change。从单词本身看，re表示再次，vise是看，想想supervise和devise，所以两者合在一起必有改的意思。原文说rock art的年龄一直在怎么样，接着又说因为有新发现，所以更早的定年出现了，所以年龄是被改变了，D正确。raise错，年龄不能一直被提出;challenge和discuss都没提出结果，而且也跟再次没关系，不选
[3] 燃料的燃烧，比如汽车燃料，并不是这种热量增加的唯一来源。另外两个因素导致了城市较高的整体温度。第一个是建造城市的材料的热容，主要典型材料是沥青和混凝土。白天，来自太阳的热量传入到这些物质当中并储存起来，在晚上被释放。但是在乡村储存能量的物质热容更低，因为植被会阻止热量轻易流入和流出地面。第二个因素是从太阳到城市的辐射热以两种形式被拦截了：(1)通过大量建筑的垂直表面的不断反射(2)通过尘埃，即大多数城市中受污染空气组成的云状物质。来自太阳的短波辐射比长波辐射要更容易穿过污染层;后者被这层物质中的气体污染物所吸收，然后重新辐射到城市的表层。
以上就是托福阅读TPO23-1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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