New words like Mao jackets, kungfu, black belt come into present-day English vocabulary due to ______.[ ]
A、social, economic and political changes
B、an upsurge of learning ancient Roman classics
C、the influence of other cultures and languages
D、the rapid development of modern science and technology
【正确答案】：C
【题目解析】：该题干中提到的例子Mao jackets(中山装), kungfu（功夫）, black belt（黑带）进入现代英语的外来词汇。英语词汇的发展原因有科学技术、政治、经济和社会，还有就是异国文化和语言，选项中A,C,D都是英语词汇发展的原因，根据题干中的例子确定答案为C。
