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TPO30-1的修辞目的题，一起来看看吧。
TPO30-1 Role of Play in Development
Paragraph 4: The benefits of play must outweigh costs, or play would not have evolved, according to Darwin' s theory. Some of the potential benefits relate directly to the healthy development of the brain and nervous system. In one research study, two groups of young rats were raised under different conditions. One group developed in an "enriched" environment, which allowed the rats to interact with other rats, play with toys, and receive maze training. The other group lived in an "impoverished" environment in individual cages in a dimly lit room with little stimulation. At the end of the experiments, the results showed that the actual weight of the brains of the impoverished rats was less than that of those raised in the enriched environment (though they were fed the same diets). Other studies have shown that greater stimulation not only affects the size of the brain but also increase the number of connections between the nerve cells. Thus, active play may provide necessary stimulation to the growth of synaptic connections in the brain, especially the cerebellum, which is responsible for motor functioning and movements.
5.Why does the author include the comment “though they were fed the same diets”?
O To show why rats living in impoverished environments need less food than those living in enriched environments
O To eliminate the possibility that differences in diet were responsibly for observed differences in brain weight.
O To emphasize the point that rats were fed only the amount of food needed to keep them alive
O To suggest that rats fed the same diet have smaller brains than those fed a varied food
解析：这里提到的试验的结果。前面从in one research of study开始描述这个试验，提到了两个对比组，under different conditions。后面是在说结果，括号里面的内容是对结论的解释说明。A,C,D三个选项一点儿都不沾边。只要高中学过一点数理化就知道这个是控制变量的试验，所以答案选B。
【4】根据达尔文理论，玩耍的好处一定超过其损失，不然玩耍就不会得以进化。其中一些潜在的好处就是直接关于动物的大脑和神经系统的健康发展。在一项研究中，两组小鼠被养在不同的环境中。第一组成长在一个比较“富裕”的环境中，这样的环境使其可以与其他老鼠接触，和玩具玩儿，并且接受迷宫训练。另一组生活在“穷困”的环境中，它们被养在独立笼子里，只有微弱的光照和极少的刺激。最后，结果表明生活在单一环境中的老鼠的大脑重量要比生活在复杂情况下的老鼠的大脑轻(即使它们被喂养的食物一样的)。另外一些研究表明，较大的刺激不仅会影响大脑的大小，而且也会增加神经细胞间连接的数量。因此，活跃的玩耍可以为大脑中的突触连接提供必要的刺激，特别是负责运动机能的小脑。
以上就是托福阅读TPO30-1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。
您还可能关注：
