问题补充：
An early invention by Albert Einstein has been rebuilt by scientists at Oxford University. They are trying to develop an environmentally friendly refrigerator that runs without electricity.
We all know that modern fridges cause damage to the environment. They work by using a kind of man-made greenhouse gas called Freon (氟里昂), which is far more damaging than carbon dioxide.
Now Malcolm McCulloch, an electrical engineer at Oxford, is leading a three-year project to develop appliances that can be used in places without electricity.
His team has completed a prototype (样机) of a fridge patented in 1930 by Einstein. It used only pressurized gases to keep things cold. The design was partly used in the first refrigerators, but the technology was dropped when more efficient compressors (压缩机) became popular in the 1950s. That meant a switch to using Freon.
Einsteins idea uses butane (丁烷) and water and takes advantage of the fact that liquids boil at lower temperatures, when the air pressure around them is lower.
If you go to the top of Mount Qomolangma, water boils at a much lower temperature than it does when you e at sea level and thats because the pressure is much lower up there, said McCulloch.At one side is the evaporator (蒸发器), a bottle that contains liquid butane. If you introduce a new vapor above the butane, the liquid boiling temperature decreases and, as it boils off, it takes energy from the surroundings to do so, says McCulloch. Thats what makes it cold.
The gas fridges based on Einsteins design were replaced by Freon-compressor fridges partly because Einsteins design was not very efficient. But McCulloch thinks that by changing the design and replacing the types of gases used it will be possible to quadruple (翻两番) the efficiency.
However, McCullochs fridge is still in its early stages. Its very much a prototype, he said. Give us another month and well have it working.
【小题1】 According to the passage, an early invention by Albert Einstein .A．has been rediscovered because it costs much less and works more efficientlyB．is being redesigned because it could be used in places without electricityC．has just been found to be energy-saving and environmentally friendlyD．will be fully made use of and become the fridge of the future【小题2】Which of the following is TRUE according to the text?A．Freon was used in fridges long before the 1950s.B．Freon is what makes current fridges big polluters.C．McCulloch thinks he could improve Einsteins design by using other types of vapors.D．The fridge Malcolm McCulloch and his team designed will be put into production soon.【小题3】We can learn from the text that the prototype completed .A．changed the air pressure around itB．was tested on the top of Mount EverestC．increased the liquid boiling temperatureD．used only pressurized gases to keep things cold【小题4】McCullochs words in Paragraph 6 .A．serve as an explanation for the principle behind Einsteins fridgeB．give you the reason why Einsteins fridge was not efficientC．tell you how to take advantage of low air pressureD．show you how Einsteins fridge worksB
答案：
(答案→)B
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