A．Sailing a boat. B．Producing electricity. C．Grinding wheat into flour. D．Pumping water from underground.
解析 细节理解题。根据第二段句子可知，人们最初利用风车磨面或抽水，十九世纪末有了电之后，人们又用其发电，因此选择B项。
答案 B
7． One of the reasons wind was rediscovered in the 1970s is that________.
A．wind power is cleaner
B．it is one of the oldest power sources C．it was cheaper to create energy from wind D．the supply of coal and gas failed to meet needs
解析 推理判断题。根据最后一段可知，二十世纪七十年代，人们注重环保，而且认识到煤和气的短缺；而风能的特点是洁净、丰富和历史悠久，但是成本较高。综合选择A项最佳。
答案 A
8． What would the author probably discuss in the paragraph that follows?
A．The advantage of wind power. B．The design of wind power plants. C．The worldwide movement to save energy.
D．The global trend towards producing power from wind.
解析 推理判断题。根据末段句子Today, there is a global movement to supply more and more of our electricity through the use of wind.可知，接下来作者应该谈论利用风能发电的情况，因此选择D项。
答案 D
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