Questions 14 to 17 are based on the following passage.At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage. The main aim of the speaker is toA．explain the derivation of the word "tip". B．illustrate why difficult customers give bad tips. C．put forward reasons for a salary increase. D．indicate how one can get better service.
试题查看
参考答案： 
答案解析