dual VS duel

　　dual是形容词，意思是“双的，双重的”

　　e.g. Sarah has dual nationality.

　　duel是名词，意思是“决斗”

　　e.g. They engaged in a verbal duel.

　　例题:

　　After completing duel bachelor’s degrees in zoology and chemistry at the University of Hawaii in 1948, Mink applied to twenty medical schools.

　　A. NO CHANGE

　　B. twice

　　C. second

　　D. dual

　　解析：

　　句中划线部分的意思是“双学位”，所以选“dual bachelor” D