Which of the following words was used during the American Civil

Which of the following words was used during the American Civil War to refer to those northerners who were secretly aiding the South?（ ）
A、Rattlesnake
B、Villain
C、Informer
D、Copperhead
【正确答案】：D
【题目解析】：本题主要考查语义转变的非语言因素。心理因素属于非语言因素的一种，例如Copperhead（铜斑蛇）词义的转变。这个词指北美的一种毒蛇，但在美国内战时期它被用来代指那些秘密援助南方的北方人。