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  3. The earliest vertical windmills were used in Persia more than 2,000 years ago for the grinding of grain. Windmills were adopted

The earliest vertical windmills were used in Persia more than 2,000 years ago for the grinding of grain. Windmills were adopted

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问题      The earliest vertical windmills were used in Persia more than 2,000 years ago for the grinding of grain. Windmills were adopted for pumping water in North America by the middle of the nineteenth century. Their use declined drastically in the 1930’s when inexpensive electricity reached the rural areas. A renewed interest in the use of wind power to generate electricity followed the energy crisis of the 1970’s. A program of the United States Department of Energy encouraged the development of new machines, the construction of wind farms, and an evaluation of the economic effect of a large scale Use of wind power.
     Public acceptance of wind energy conversion systems is an important consideration in planning for the widespread application of wind energy. Studies have shown that the environmental impact of such systems is relatively small compared with conventional electric power systems. Wind-powered systems do not require the flooding of large land areas or the alteration of the natural ecology, as dohydroelectric systems. Furthermore; they produce no waste products or thermal or chemical effluents, as fossil-fueled and nuclear fueled systems do.
From the passage it can be assumed that wind energy is better because ______.
选项 A、it is cheaper than electric power
B、it does not alter the environment as much as other types of power
C、it lasts longer than electric power
D、it is more efficient than electric power
答案A
解析 此题为推论题。根据线索词，水力发电需要“the flooding of large areas”、“the alteration of ecology”，而且还“produce waste”，这说明电能成本大，因而可推断出风能耗资少，因此A项为正确选项。
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