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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问答题

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