单项选择题

Questions 14 to 16 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 speaker, what is one of the duties of specially trained staff members

A．To build fires.
B．To conduct scientific studies.
C．To train other staff members.
D．To guide nature walks.

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单项选择题

单项选择题

Questions 14 to 16 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 speaker, what is one of the duties of specially trained staff members 您的浏览器不支持 audio 元素。