参考答案passage one46. [B] He intends to get rid of the tipping practice.47. [C] It forces the customer to comensate the waiter.48. [D] They can have some say in how much their servers earn.49. [A] Services quality has little effect on tip size.50. [D] Waiters should be paid by employers instead of customers.passage two51. [C] The impact of cheap oil on global economic growth.52. [D] Consumers will spend their savings from cheap oil on other commodities.53. [C] They use their money reserves to back up consumption.54. [B] Its negative effects more than cancel out its positive effects.55. [A] People are not spending all the money they save on gas.