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Questions 11-13 are based on the following conversation. You now have 15 seconds to read Questions 11-13. What are the speakers mainly discussing

A．Ways to determine the age of a fossil.
B．The identity of a fossil the woman found.
C．A comparison of two shellfish fossils.
D．Plans for a field trip to look for fossils.

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Li Yan tried on three jackets. The first one was black with

单项选择题

What is the author's main purpose

A．To make the point that animal emotions are worth our attention.
B．To explain what reflexive behaviors are.
C．To compare human emotions with animal emotions.
D．To discuss the importance of emotions.

Questions 11-13 are based on the following conversation. You now have 15 seconds to read Questions 11-13. What are the speakers mainly discussing 您的浏览器不支持 audio 元素。

Questions 11-13 are based on the following conversation. You now have 15 seconds to read Questions 11-13. What are the speakers mainly discussing