单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
According to the passage we know tipping cannot be explained ______.

A．economically
B．culturally
C．psychologically
D．biologically

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单项选择题

单项选择题

Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. According to the passage we know tipping cannot be explained ______. 您的浏览器不支持 audio 元素。