根据下列文章,请回答 46～50 题。 Mind Those Manners on the Subway So, there you are, just sitting there in the subway car, enjoying that book you just bought. (46) Or, the person sitting next to you takes out a nail clipper (指甲刀) and begins cutting his or her nails. Annoying? Many of us have to spend some time every day on public transportations. (47) So, to make the trip more pleasant, we suggest the following: Let passengers get off the bus or subway car before you can get on. (48) Stand away from the doors when they are closing. Don't talk loudly on a bus or subway. Chatting loudly with your friends can be annoying to others. (49) Don't think your bags and suitcases (手提箱) deserve a seat of their own. Use a tissue whenever you cough or sneeze (打喷嚏). An uncovered sneeze can spread germs (细菌), especially in crowded places. Don't cut your nails or pick your nose on public transportation. Don't read over other people's shoulder. (50) It can make people uncomfortable. They might think you're too stingy (小气的) even to buy a newspaper. Or they might think you're judging their behavior.