托福综合写作：人的脑子越来越小的三个原因
对于现在正在进行托福综合写作的同学来说，对于写作考试有没有把握呢？接下来就和我爱学习网一起来看看托福综合写作：人的脑子越来越小的三个原因
考题回忆：
总论点
阅读部分：
1. 气候变化导致人类的体型变小，所以脑子也相应变小。
2. 现代农业主要种植谷物，但grain中的低蛋白会使得脑子变小
3. 肌肉萎缩使得脑子变小
听力部分1. 在20000年前，那时候的气候更加多变，人类的脑子也没有变小
2. 澳大利亚和一些国家是到了现代，才开始吃grain，但他们的脑子和其它东方的人却一样变小了
According to the reading article， there are three reasons available to explain why humans’ brains get smaller. However， the professor casts doubt on these three explanations respectively by elaborating details.
Firstly， the passage refers that the unpredictable climate change is the one to blame for the the smaller size of people’s brains. In terms of this factor， the professor presents her opposite opinion by asserting that dating back to 20000 years ago when the climate change was frequent， brains were not shrinking. In this sense， even though the current climate is changeable， it cannot illustrate why humans’ brains become smaller in this phase.
Secondly， in the author’s opinion， the prevalence of grains which are rich in low-protein causes people’s brains to undergo shrinkage. Likewise， this theory is also contradicted by the professor. To illustrate， some countries like Australia did not start eating grain until recent centuries. Yet， like the brains of people from others countries， those of these areas also reduced in size.
Lastly， the lecturer admits the decrease of muscles. Nevertheless， it should not be responsible for brain shrink. It is easy to note that the rate of muscle shrink is lower that that of brain shrink. Thus， muscle shrink does not hold water.
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