unit 1 great scientists
导读：常言道，人生七十古来稀，在中国，随着生活质量的提高和医疗保障的健全，活到70岁已不算新鲜事，但新的社会问题——空巢(empty nest)现象也随之出现。中国人开始惧怕变老。
task：what do you know about the social problem — aging？
fear aging process
according to a new global survey among 12,262 people in 12 countries about their attitudes toward aging, 28 percent of the chinese polled said they feel depressed when they think about getting old. people in资源难易程度:★★★★★★★★★★★★★★★
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