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TPO28-2的修辞目的题，一起来看看吧。
TPO28-2 Early Saharan Pastoralists
Paragraph 3: Smith believes that the hunters were well aware of the more disciplined ways in which their prey behaved. Instead of following the cattle on their annual migrations, the hunters began to prevent the herd from moving from one spot to another. At first, they controlled the movement of the herd while ensuring continuance of their meat diet. But soon they also gained genetic control of the animals, which led to rapid physical changes in the herd. South African farmers who maintain herds of wild eland (large African antelopes with short, twisted horns) report that the offspring soon diminish in size, unless wild bulls are introduced constantly from outside. The same effects of inbreeding may have occurred in controlled cattle populations, with some additional, and perhaps unrecognized, advantages. The newly domesticated animals behaved better, were easier to control, and may have enjoyed a higher birth rate, which in turn yielded greater milk supplies. We know from rock paintings deep in the Sahara that the herders were soon selecting breeding animals to produce offspring with different horn shapes and hide colors.
6.Why does the author mention the “rock paintings deep in the Sahara”?
O To help explain why the hunters wanted to control the herds.
O To provide support for the idea that the herders soon gained genetic control of the cattle
O To show that the herders had artistic as well as practical abilities
O To argue that the herders soon began to value their cattle for more than food.
解析：这个例子之前一直在说herders gained genetic control和其影响。然后给出这个例子，后面的内容也在说放牧人是怎样进行基因控制的。所以应该选B。
[3] Smith相信猎人对猎物更加自律的行为了然于胸。猎人们不再跟随骆驼进行每年一度的迁徙而是开始阻止兽群的迁移。起初他们控制兽群的迁移以获得持续的肉食来源。但很快他们能够在遗传上控制动物，使得兽群的体征迅速变化。南非牧养大羚羊(一种体型较大的非洲羚羊，它们的角短且扭曲)的农民说如果不持续从野外引进公羚羊则其后代体型迅速变小。近亲繁殖的影响同样发生在控制拥有某些额外的可能并未认清的优势的骆驼数量上。最新驯化的动物更易控制，出生率也更高，而反过来也会提供更多奶源。我们从撒哈拉腹地的岩石绘画可知牧民很快就选择一些动物进行繁殖以产生角和颜色不同的后代。
以上就是托福阅读TPO28-2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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