Different countries have different customs. When you are in different countries, you should follow their customs.

 In China, it`s impolite to talk when eating dinner. And you`re not supposed to start eating first if there are older people at the table.

Very often people who travel to the United States forget to tip(付小费). It is usual to tip waiters, taxi drivers and porters who help carry your bags. Waiters expect to get a 15% tip on the cost of your meal. Taxi drivers expect about the same amount.

 In England, make sure to stand in line even if there are only two of you. It`s important to respect(尊重) lines there. It`s a good idea to talk about the weather. It`s favorite subject of conversation with the British.

 In Spain(西班牙)，it`s a good idea to have a light meal in the afternoon if someone invites you for dinner. People have dinner very late ,and restaurants do not generally open until after 9:00 pm.

 In Saudi Arabia(沙特阿拉伯)，men kiss one another on the cheek(脸颊).Your  host may welcome you with a kiss on both cheeks. It is polite for you to do the same.

 In Japan, people usually give personal or business cards to each other when they meet for the first time. When a person gives you a card, don`t put it into your pocket(口袋) as soon as you get it. The person expects you to read it.

 Don`t forget to be careful of your body language to express something in conversations. A kind of body language that is acceptable in one culture may be impolite in another.

研究表明，宋代的商税率大致为3％，国家对商业的征税力度比农业要低得多；清代商人出现亏损时，政府常常要“优商”“恤商”。但历代统治者很少在农家收成下降时优恤农民。这反映了（     ）

甲、乙两人玩数字游戏，先由甲在一张卡片上任意写出一个数字，记为a，再由乙猜甲刚才写出的数字，把乙猜出的数字记为b，且a，b∈{1，2，3}，若|a﹣b|≤1，则乙获胜，现甲、乙两人玩一次这个游戏，则乙获胜的概率为（　　）