题目

If you are sitting at a table with people you don’t know, it is impolite to smoke without first asking if it will disturb them. At American restaurants and coffee shops, cold water is usually served before you order. You may find the bread and the butter are free, and if you order coffee, you may get a free refill. Most cities and towns have no rules about opening and closing time for stores and restaurants, though they usually do make rules for bars. Especially in big cities, stores may be open 24 hours a day. Servings in restaurants are often large. If you can’t finish the meal bu下列化简中，正确的是 [     ]A.B.3C.D.