单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What type of scientific discoveries does the woman mainly talk about

A．Archaeological.
B．Biological.
C．Meteorological.
D．Sociological.

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单项选择题

单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What type of scientific discoveries does the woman mainly talk about 您的浏览器不支持 audio 元素。