What is a lingua franca？ Explain whether English is an intemational lingua franca.
【正确答案】：1）A lingua franca is a variety of language that serves as a medium of communication among groups of people from diverse linguistic backgrounds.
2）A lingua franca may be used internationally across the world. English is such an international lingua franca, used in numerous social and political situations where a common language is asked for，， For example, English has become a lingua franca for international scientific journals and international scientific meetings.
评分标准：1）定义占4分；2）解释占6分。答错或没有答全，酌情扣分
