[解析]
(1)细节理解题。根据第一段People experience emotional pain — often in the form of guilt (内疚) — when spending money.This is called the moral tax(道德税) or pain of payment.(人们在花钱的时候会经历情感上的痛苦——通常表现为内疚。这就是所谓的道德税或支付之痛)可知,道德税指的就是因为花钱造成的情感方面的痛苦感受。故选D。
(2)推理判断题。根据第五段How can Anne be happy with Alex making a purchase she previously thought unnecessary?It all comes down to moral tax.By making the payment on Anne's behalf,Alex cuts her wife's pain of payment.(亚历克斯买了一件她以前认为不必要的东西,安妮怎么能开心呢?这一切都归结为道德税。通过替安妮付款,亚历克斯减轻了她妻子的付款痛苦)可推测,安妮自己不买那双鞋是受道德税的影响。故选B。
(3)推理判断题。根据第五段Looking at it from an economic point of view,Anne's happiness doesn't make any sense. (从经济学的角度来看,安妮的开心没有任何意义)可推测,一个经济学家会认为安妮的开心是没有道理的,夫妻俩谁买都是花了家里的钱,unreasonable和doesn't make any sense.意思相近。故选A。
(4)细节理解题。根据最后一段The experts suggest that the best gifts are things that people really want but refuse themselves to avoid feeling guilty.(专家建议,最好的礼物是人们真正想要的,但为了避免内疚而拒绝自己的东西)可知,专家建议最好的礼物应该是对方特别想要但自己为避免花钱带来的内疚感而没买的东西。故选C。