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前段时间为gre考生汇总了gre issue写作提纲思路和分析，希望对考生在攻破gre issue写作上有所帮助。接下来的几天我们将为gre考生整理gre argument部分的提纲内容。希望通过我们的整理和汇总，让gre考生真正能掌握gre写作的精髓。 题目题材：生命科学 gre argument53题目： Thirteen years ago, researchers studied a group of 25 infants who showed signs of mild distress when exposed to unfamiliar stimuli such as an unusual odor or a tape recording of an unknown voice. They discovered that these infants were more likely than other infants to have been conceived in early autumn, a time when their mothers production of melatonina hormone known to affect some brain functionswould naturally increase in response to decreased daylight. In a follow-up study conducted earlier this year, more than half of these childrennow teenagerswho had shown signs of distress identified themselves as shy. Clearly, increased levels of melatonin before birth cause shyness during infancy and this shyness continues into later life. 提纲： （1）The sample of the mentioned study is too limited. （2）No direct evidence is provided to show that it is the high levels of mothers production of Melatonin that resulted in the distress showed by the infants studied. | 
