【正确答案】正确答案：The first example of humor is created by homonymy, while the second is created by semantic analysis. Homonymy refers to the phenomenon that words having different meanings have the same form, i. e. different words are identical in sound or spelling, or in both. It contains the following three aspects, homophones, homographs and complete homonyms.(2 points) In the first example, "charge" has several meanings, in the first sentence, in fact this word means " move quickly and violently" ; while in the second sentence, when people say " take away his credit card", and they think that the meaning of "charge" is "demand payment". Since an elephant is impossible to have a credit card, so the whole question and its answer sound ridiculous and also funny. Thus a sense of humor is created.(4 points) In the second example, "追" means "run after" , while "堵截" means "prevent(sb./sth.)from moving or progressing" , which implies one must stands in front of the one who is blocked. But in the sentence "前有追兵、后有堵截", the spatial positions are completely inverted. Thus a sense of humor is created.(4 points)

【答案解析】解析：考查一词多义或同形异义现象及语义分析。a中的幽默之处在于，charge这个词有多个意思，有“进攻”的意思，也有“收费”的意思，利用这一点制造出了一种幽默。b的幽默之处在于，根据词义，追兵只能出现在人的后面，在后面才被称之为“追”，而出现在前面的则被称之为“堵”，该句语义倒置，违背常识，带来一种幽默效果。