You're out to dinner. The food is delicious and the service is fine. You decide to leave a big fat tip. Why? The answer may not be as simple as you think.

    Tipping, psychologists have found, is not just about service. Instead, studies have shown that tipping can be affected by psychological reactions to a series of different factors from the waiter's choice of words, to how they carry themselves while taking orders, to the bill's total. Even how much waiters remind customers of themselves can determine how much change they pocket by the end of the night.

    “Studies before have shown that mimicry(模仿) brings into positive feelings for the mimicker,” wrote Rick van Baaren, a social psychology professor. “These studies show that people who are being mimicked become more generous toward the person who mimics them.”

    So Rick van Baaren divided 59 waiters into two groups. He requested that half serve with a phrase such as. “ Coming up !” Those in the other hall were instructed to repeat the orders and preferences back to the customers. Rick van Baaren then compared their take-home pay. 'The results were clear—it pays to mimic your customer. The copycat(模仿者) waiters earned almost double the amount of tips to the other group.

    Leonard Green and Joel Myerson, psychologists at Washington University in St. Louis, found the generosity of a tipper maybe limited by his bill. After research on the 1,000 tips left for waiters, cabdrivers, hair stylists, they found tip percentages in these three areas dropped as customers' bills went up. In fact, tip percentages appear to plateau(稳定期) when bills topped $100 and a bill for $200 made the worker gain no bigger percentage tip than a bill for $100.

    “That's also a point of tipping,” Green says. “You have to give a little extra to the cabdriver for being there to pick you up and something to the waiter for being there to serve you. If they weren't there, you'd never get any service. So part of the idea of a tip is for just being there.”

由图可知倒入量筒中的老醋的质量为____g，老醋的密度是____kg/m³。

读材料一和材料二，完成下列各题.

材料一：2016年3月3日至8日，《航拍中国》第一季共6集将在央视纪录频道完整推出（其中，上海、新疆、黑龙江、江西、陕西、海南篇在7号晚八点播出）。在很多网友心里，这是“把中国拍得最美的一部神作”。

材料二：

材料一 全会强调，如期实现全面建成小康社会奋斗目标，推动经济社会持续健康发展，必须坚持党的领导。各级党委必须深化对发展规律的认识，完善党领导经济社会发展工作体制机制，加强党的各级组织建设，强化基层党组织整体功能。动员人民群众团结奋斗，贯彻党的群众路线，提高宣传和组织群众能力，加强经济社会发展、重大问题和涉及群众切身利益问题的协商，依法保障人民各项权益。激发各族人民建设祖国的主人翁意识。加强思想政治工作，创新群众工作体制机制和方式方法，最大程度凝聚全社会推进改革发展，维护社会和谐稳定的共识和力量。

材料二 实现“十三五”时期发展目标，破解发展难题，厚植发展优势，必须牢固树立创新、协调、绿色、开放、共享的发展理念。坚持创新发展、协调发展、绿色发展、开放发展、共享发展，是关系我国发展全局的一场深刻变革。