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外语
A、When it is used in rural areas. B、When it is environment-friendly. C、When it operates at near capacity. D、When it operates at
A、When it is used in rural areas. B、When it is environment-friendly. C、When it operates at near capacity. D、When it operates at
admin
2016-02-04
42
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 scientists’ standpoint, all 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 Americans’ wheels go around. If we could figure out how to improve the efficiency with which we use energy, we can 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 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 might 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.
22. What does the speaker say about energy used in the United States?
23. What do scientists say about energy contained in fuel?
24. When does mass transit prove superior to private vehicles?
25. What seems to be the speaker’s biggest concern?
选项
A、When it is used in rural areas.
B、When it is environment-friendly.
C、When it operates at near capacity.
D、When it operates at regular times.
答案
C
解析
四个选项均以When开头,used和operates均为表示使用、操作类的词汇,因此推测本题与使用某物的条件有关。短文中提到公共交通工具只有在发挥最大能效时,才能在能源使用效率和清洁度上优于私人交通工具,故答案为C)。
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0
大学英语六级
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