阅读理解。 'Tipping' (小费) is always a difficult business. You do not want to give too much or too little, or tip the wrong person. In the UK and the USA, people usually tip waiters in restaurants, porters, taxi drivers and hairdressers. They do not tip people in offices, cinemas, garages or airports. Do you invite your friend to the restaurant? Then you pay the bill. Does your friend invite you? Your friend pays. If there are men and women in the party, the men usually pay. These days, men and women are equal (平等) in many ways. If you work in Britain or America, your boss could be a man or a woman. There are increasing numbers (增长数据) of women in important positions in politics (政治), law, medicine and in the business world. But it is still polite for a man to open doors for women and to ask them to go first. And it is polite for men to stand up when they are introduced to women. On informal occasions (非正式场合), of course, everyone is more relaxed. 1. In his passage, the writer tells us . [     ] A. not to give any tip to others B. only to give up to women C. only to give tip to old men D. to give tip to the right person 2. If you invite your friends to a restaurant, . [     ] A. you should pay the bill B. your friends should pay the bill C. the person who orders the meal should pay the bill D. you should ask your friends to pay the bill 3. Today in Britain and America . [     ] A. women are quite equal to men B. men hold all the important positions in politics C. women hold all the important positions in business D. women have changed their conditions in many ways 4. It is polite for a man to . [     ] A. sit beside women B. let women go first C. stand beside a lady D. drink for a lady 5. Which is impolite? [     ] A. To open doors for women. B. To ask women to go first. C. To stand up when men are introduced to women. D. To ask women to pay for a party.