2. 考研
  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

admin2013-07-08  51
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 author’s opinion towards solar and wind energy?
选项 A、The author thinks of them as the best energy in the future.
B、The author believes they can contribute to the US power.
C、The author shows no interest in them.
D、The author hopes they can replace the fossil fuels quickly.
答案B
解析 观点态度题。通观全文，我们能够看出作者既说明了太阳能和风能的优点，又以主要篇幅讲述了二者的缺点，最后一段说明未来的社会需要二者相互结合，以达到最好的效果。因此[B]“作者相信它们能为美国的能源做出贡献”符合题意。[A]“作者认为太阳能和风能是未来最好的能源”，文章中主要讲解的二者的缺点，故排除；[C]“作者对二者不感兴趣”，文章最后一段作者表达了其看法，即要恰当地利用这两种能量，故排除；[D]“作者希望太阳能和风能可以快速取代矿物燃料”，文章只提到了二者需要矿物燃料的支持，未提及二者取代矿物燃料，故排除。
转载请注明原文地址:https://kaotiyun.com/show/OzO4777K
0

考研英语一

相关试题推荐
随机试题
最新回复(0)