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. “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 Baren divided 59 waiters into two groups. He requested that half serve with a phrase such as, “Coming up!” Those in the other half were instructed to repeat the orders and preferences back to the customers. Rick van Baaren then compared their take-home(实得收入). The results were clear---it pays to mimic your customer. The copycat 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 may be limited by his bill. After research on the 1,000 tips left for waiters, cab drivers, hair stylists, they found tip percentages in these three areas dropped as customers’ bills went up. “That’s also a point of tipping,” Green says. “You have to give a little extra to the cab driver 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.” 小题1:According to the passage, a customer gives the cab driver a tip for ____.
 小题3:According to the passage, we know the writer seems to _________.
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