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  3. The Features of Solar and Wind Energy Solar and wind energy seem to have captured the public’s support as potentially being

The Features of Solar and Wind Energy Solar and wind energy seem to have captured the public’s support as potentially being

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问题                  The Features of Solar and Wind Energy
    Solar and wind energy seem to have captured the public’s support as potentially being the primary or total answer to our electric power needs despite the fact that solar cells and wind energy systems don’t always provide electric power.
    Solar cells and wind turbines are attractive because they are "renewables" and because they emit no C02, during operation. But because solar and wind electricity are available only part of the time that consumers demand power, they cannot provide energy " on demand", something that the public requires. We expect the lights to go on when we turn on a switch, and we do not expect our computers to shut down as nature dictates.
    Large-scale electric energy Storage with hydroelectric dams is a good way to solve the problem, but when we use hydroelectric dams for electric energy storage, we reduce their electric power output, which would otherwise have been used by consumers. In other words, we suffer a loss to gain power on demand from wind and solar.
    At locations without such hydroelectric dams, which are most places, solar and wind electricity systems must be backed up 100 percent by other forms of generation to ensure against blackouts. In today’s world, that backup power can only come from fossil fuels. Then the public will pay a large amount of money for solar and wind—paying once for the solar and wind system and again for the fossil fuel system.
    Finally, because solar and wind have the capacity to deliver only 30 to 40 percent of their full power ratings in even the best locations, they provide a C02 reduction of less than 30 to 40 percent, considering the fossil fuels needed for the backup. That’s far less than the 100 percent that many people believe, and it all comes with a high cost.
    The United States will need an array of electric power production options to meet its needs in the years ahead. Solar and wind will have their places, as will other renewables. Realistically, however, solar and wind will probably only provide a modest percentage of future US power. Some serious realism in energy planning is needed, especially from analysts who are not backing one horse or another.
Why does the public support solar and wind energy?
选项 A、Because the public consider them the best substitutes for electricity.
B、Because the public believe they can provide enough electricity in the future.
C、Because they can supply electricity at any time in any places.
D、Because they are the most economical energy in the world.
答案B
解析 事实细节题。由题干中的public support定位到第一段可知，尽管太阳能电池和风力发电系统不能持续长久的供电，大众还是认为它们能满足未来用电需求。故[B]“大众相信它们能够提供足够的电力”与原文意思相符。[A]“大众把它们看作是电力能源的最佳替代晶”，本段中人们认为地二者可以被用来发电，而不是直接取代电力，故排除；[C]“它们可以随时随地的提供电流”，与本段意思不符，故排除；[D]“它们是世界上最经济的能源”，文章当中并未对能源的经济性做出对比，故排除。
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