四海一家 第五次作业

dream191919UID: 2245981

由于家里上网不方便，这次作业推迟了几天公布，实在抱歉。




第五次作业   2月18日



Issue43"To be an effective leader, a public official must maintain the highest ethical and moral standards."


argument53
53Thirteen 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 melatonin—a hormone known to affect some brain functions—would naturally increase in response to decreased daylight. In a follow-up study conducted earlier this year, more than half of these children—now teenagers—who 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.