1. D。细节题。根据第一段及关键句 …it is impolite to light up a cigarette without asking if it will disturb them 可知 A、B、C 与原文不相符，同时关键句告诉我们“未经他人允许吸烟是不礼貌的”可知 D 为正确选项。
2. D。细节题。根据 At American restaurants and coffee shops you are usually served tap water before you order 可见在点菜之前提供的是自来水，据此选 D
3. C。细节题。根据 If you can’t finish your meal but would like to enjoy the food later, ask your waitress or waiter for a “doggie bag” 得知它与答案 C 的表达相符，故选 C。
