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托福阅读修辞目的题：Play in Development

2015-08-13 16:24:24来源：网络

　　【托福阅读题型：Play in Development修辞目的题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之修辞目的题

　　托福阅读修辞目的题：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.(Role of Play in Development)

　　Why does the author include the comment “though they were fed the same diets”?

　　○ To show why rats living in impoverished environments need less food than those living in enriched environments

　　○ To eliminate the possibility that differences in diet were responsibly for observed differences in brain weight

　　○ To emphasize the point that rats were fed only the amount of food needed to keep them alive

　　○ To suggest that rats fed the same diet have smaller brains than those fed a varied food

　　答案见下一页：

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