单选题

单选题 Who most likely is the speaker?
【正确答案】 C
【答案解析】[听力原文] 77-79
Questions 77~79 refer to the following announcement.
在进入植物园旅行之前向游客发出的公告
单选题 What are listeners permitted to do?
【正确答案】 C
【答案解析】
单选题 What are listeners encouraged to do right away?
【正确答案】 A
【答案解析】