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[originaltext] Every year, people in America use energy equal to over 30 mil
[originaltext] Every year, people in America use energy equal to over 30 mil
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2023-08-04
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问题
Every year, people in America use energy equal to over 30 million barrels of oil each day. That’s energy in all forms: oil, gas, coal, nuclear, solar and even wind power. Viewed from a scientist’s standpoint, all of the energy contained in fuel, either now or in the future, becomes heat. Some of the heat is used directly or produces useful work. The rest is lost or rejected, radiated into the atmosphere from the engines, motors, boilers and all the other energy-consuming machinery that makes America’s wheels go around. If we could figure out how to improve the efficiency with which we use energy, we could do a lot more work with the energy that is available. With money and careful planning, we can boost efficiency up to a point. Yet improvement won’t come easily. It won’t come overnight and there are limits beyond which not even science can take us. According to the Centre for Strategic and International Studies, about three quarters of the energy we use to move things, including ourselves, accomplishes no useful work. In terms of efficiency and cleanness, buses, trains and other forms of public or mass transportation are superior to the private automobile, but only if they operate at near capacity. Otherwise, their overall efficiency is poor. For some people, mass transit may answer all transportation needs. For others, a combination of mass transit and private transportation may be desirable. Better design and wiser use of both mass transit systems and private vehicles will play an important part in helping America get more out of energy used for transportation.
12.What does the speaker say about energy used in the United States?
13.What do scientists say about energy contained in fuel?
14.When does mass transit prove superior to private vehicles?
15.What seems to be the speaker’s biggest concern?
选项
A、It eventually turns into heat.
B、It is used in a variety of forms.
C、Its use is chiefly responsible for air pollution.
D、Part of it is lost in the process of transmission.
答案
A
解析
文章前面部分提到,从科学家的角度来看,无论是现在还是将来,燃料中含有的所有能源都会成为热量。因此可以得出A项为正确答案。B项为干扰选项,前文提到美国人所使用的能源包含所有形式的能源,并不是说燃料中包含的能源被以多种形式使用,故排除;C项在文中未提及,故排除;短文提到,一些热量直接被利用或产生有用功,其余的热量则流失掉或者被排放,并不是说一部分能源在运输过程中流失,故D项也与原文内容不符,应排除。
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