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Answer the following questions. Your answers should be clear and short.​What are the three main sources of new words in present-day English vocabulary? Match the following expressions with the three sources as examples.“green revolution", “fast food”，‘the fourth world”，“Mao jackets”, “open heart surgery ”
【正确答案】：

​GENERALLY, THERE ARE THREE MAIN SOURCES OF NEW WORDS:（1）THE RAPID DEVELOPMENT OF MODERN SCIENCE AND TECHNOLOGY, E.G. GREEN REVOLUTION,OPEN HEART SURGERY. （2）SOCIAL, ECONOMIC AND POLITICAL CHANGES, E.G. FAST FOOD, THE FOURTH WORLD.（3）THE INFLUENCE OF OTHER CULTURES AND LANGUAGES, E.G. MAO JACKETS. 

【题目解析】：一般来说，新词有三个主要来源：（1）现代科学技术的快速发展，如绿色革命、心脏外科手术；（2）社会、经济和政治变革，如快餐、第四世界；（3）其他文化和语言的影响，如毛式服装（中山装）。