单项选择题
Questions 19 to 22 are based on’ the conversation you have just heard.
A. It is used to add sugar. B. It is used for mixing tea. C. It is used for measuring tea. D. It is used as a tea container.
A. To compare two business models. B. To introduce a new business model. C. To advocate sustainable development. D. To predict a change of the global market.