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Answer the following questions. Your answers should be clear and short.As far as growth of present-day English vocabulary is concerned, what are the three main sources of new words?
【正确答案】：

THEY ARE THE RAPID DEVELOPMENT OF MODERN SCIENCE AND TECHNOLOGY; SOCIAL, ECONOMIC AND POLITICAL CHANGES; THE INFLUENCE OF OTHER CULTURES AND LANGUAGES.

【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；（2）社会、经济和政治变革；（3）其他文化和语言的影响。