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
We can learn from the passage that ______
A．the solar water heaters are very difficult to build
B．the system has been widely used
C．the system is based on a design developed in Arabia
D．the solar water heater consists of three parts
问答题
Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be done at normal speed, listen and try to understand the meaning. For the second ana third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of l5 seconds. The last reading will be done at normal speed again and during this time you should check your work. You will then be given 2 minutes to check through your work once more.
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