Which of the following is NOT one of the main sources of new words in the presentday English vocabulary? （ ）
A、The rapid development of modern science and technology.
B、Social, economic and political changes.
C、The invasion of foreign countries.
D、The influence of other cultures and languages.
【正确答案】：C
【题目解析】：外国的入侵对现代语言产生了一定影响，而不是对当代语言。