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单选题

A．Wool timber and cotton.
B．Milk, cheese and meat.
C．Fish, wool, and wheat.
D．Milk, fish and timber.

参考答案B

解析:B

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单选题 Questionsare based on the following passage.

A United Nations panel on climate change says global warming is causing extreme weather all over the world and the situation is getting urgent. The specialists are 26 on governments to come up with new ideas to 27 gas emissions. Since much of the air pollution comes from coal-fired power plants, scientists in Denmark are trying to lower their nation's energy needs with new types of smart streetlights.
Our 28 industrialized world needs huge amounts of electrical energy, but our power plants still rely mostly on technology 29 as early as the 19th century - coal-powered plants, hydroelectric dams or somewhat newer nuclear energy, all of which have their own 30 Renewable sources, such as solar plants and wind turbines, have just started making inroads (侵袭) in lowering harmful emissions, while safer fusion-based nuclear plants are believed to be many decades off.
But scientists say we can slow down global warming by lowering energy demands for street lights. These common features of the world's urban areas require a lot of electricity.
The U.S. Energy Information Administration estimates that in 2012, lighting for buildings, streets and highways in the U.S. used about 274 billion kilowatt hours.
In a bid to make Copenhagen the world's first carbon-neutral city by 2025, scientists in the Danish capital are testing a variety of new street lighting technologies. With these technologies, we can 31 the run time, the efficacy, the lumen output or the power consumption, and then we do real time measurements on the lux levels on the street level.
The main goal is to lower energy 32 when the light is not needed. So the lamp brightens up only when it senses an approaching pedestrian, cyclist or vehicle. Some of them even have a 33 wind generator or a solar cell.
Scientists say 34 the smart lights city-wide could save up to 85 percent of the current budget for 35 the Copenhagen streets．
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