Describe the similarities and differences between a pidgin and a lingua franca.
（1）A pidgin is a variety of language that is generally used by native speakers of other languages as a medium of communication.
（2）A lingua franca is a variety of language that serves as a common speech for social contact among groups of people who speak different native languages or dialects.
（3）Like a lingua franca, a pidgin is used for some practical purposes, such as trading. by groups of people who do not know each other 's languages.
（4）Different from a lingua franca, which may have native speakers such as English, a pidgin is not a native language of a particular region, but simply a marginal language used by people whose cultures are sharply separated and whose business contact is very
评分标准：（1）和(2）各占2分，（3）和(4）各占3分，没有答全或出错酌情扣分。
