段3：①This slim volume is packed with tips to help wage slaves as well as lottery winners get the most “happiness bang for your buck.” ②It seems most people would be better off if they could shorten their commutes to work, spend more time with friends and family and less of it watching television (something the average American spends a whopping two months a year doing, and is hardly jollier for it). ③Buying gifts or giving to charity is often more pleasurable than purchasing things for oneself, and luxuries are most enjoyable when they are consumed sparingly. ④This is apparently the reason McDonald’s restricts the availability of its popular McRib—a marketing trick that has turned the pork sandwich into an object of obsession.
23. McRib is mentioned in Paragraph 3 to show that .
[A] consumers are sometimes irrational
[B] popularity usually comes after quality
[C] marketing tricks are often effective
[D] rarity generally increases pleasure
答案：D
问：McRib的例子所服务的观点对应原文中的哪句话？
A : 段3句②
B : 段3句③
C : 段3句④
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