The word “sandwich” now denotes a popular fast food. It originates from John Montague, Fourth Earl of Sandwich in 18th century. This example shows one of the sources of English vocabulary is（） .
A、compound
B、proper nouns
C、back-formation
D、conversion
【正确答案】：B
【题目解析】：Modern English has a large number of words which come from proper nouns. They include names of people, names of places, names of books and trade names. A good example of such is the word“sandwich” , which now denotes a popular fast food. It originates from John Montague, Fourth Earl of Sandwich in 18th century.现代英语中有很多词汇来源于专有名词，包括人名、地名、书名和商品名。一个很好的例子就是“三明治（sandwich）”这个词，它现在代表一种流行的快餐。它起源于18世纪的第四代三明治伯爵约翰·蒙塔古。
