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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.
What’s the possible result if we use hydroelectric dams for electricity storage?
选项 A、We will have enough electric power.
B、We can make full use of the hydroelectric dams.
C、The losses will outweigh the benefits we get.
D、Water will not be used to generate electricity any more.
答案C
解析 推理判断题。由题干中的hydroelectric dams定位到第三段第一句可知，用水力发电站的大坝进行大规模的电力储存是解决这一问题的好办法，但是如果我们把水电站的大坝用来存储能量，就会减少水电站本应输送给消费者使用的电量．换句话说，我们不惜蒙受巨大损失用风能和太阳能获取符合要求的电能。故[C]“我们蒙受的损失将超过获得的好处”与文章中意思相符。[A]“我们会有充足的电”，与文意相悖，故排除；[B]“我们就能充分利用水电站的大坝”，用水电站大坝储存能量会让我们蒙受损失，与文中的意思不符，故排除；[D]“再也不会用水力发电了”，文章并未提及水力发电，故排除。
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