单项选择题

Questions 19 to 21 are based on the conversation you have just heard.

A．He hiked along the Colorado River.
B．He explored the Colorado River.
C．He camped along the Colorado River.
D．He visited the Colorado city,

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All of us have read thrilling stories ______ (故事中的主人公只能活一段很有限的时光).

Questions 19 to 21 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。