单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
The topic of this passage is ______.

A．splashing white-water rivers
B．the Appalachian trail
C．western Maine
D．narrow gauge pathway

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. The topic of this passage is ______. 您的浏览器不支持 audio 元素。