answer: implies the satisfying of a question, demand, call, or need: ~ all the questions on the form.  


respond: may suggest a willing or spontaneous and often quick reaction: chose not to ~ to that comment.


reply: implies making a return commensurate with the original question or demand: a request that you must ~ at once. (commensurate与...相关或依赖于根据(depend on): the salary will be commensurate with experience薪水和经验相关，或薪水根据经验)


rejoin: often implies sharpness and pointedness in answering: she ~ quickly to his criticism.


retort: suggests responding to an explicit charge or criticism by way of retaliation: he ~ to her every charge with biting sarcasm.  (sarcasm讥讽挖苦: 目的不是取笑而是使人疼痛如例句)


answer回答满足: 表示满足提问要求呼吁需求等， respond回应:  表示反应得快速自愿自发(willing自己愿意,spontaneous自发,没人催促)，reply回复: 泛指根据提问要求做回应，rejoin尖锐回答: 常表示尖锐回答(sharp,pointed)，retort还击: 针对指责批评的报复性回击(by way of retaliation)


记忆方法: 1）首字母ARRRR想成四人一心<==回应问题挑战


         2）回应的意思是说写做某事作为回复mean to say, write, or do something in return. (in return其实就是回应)