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  3. Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that

Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that

admin2010-01-13  42
问题    Scraps of food could soon be helping power your home, thanks to an ultra-cheap bacteria-driven battery. Its developers hope that instead of feeding the dog or making garden compost(混合肥料) ,organic household waste could top up your home’s electricity.
   Although such "microbial fuel cells" (MFCs)have been developed in the past, they have always proved extremely inefficient and expensive. Now Chris Melhuish and technologists at the University of the West of England(UWE)in Bristol have come up with a simplified MFC that costs as little as ￡10 to make.
   Right now, their fuel cell runs only on sugar cubes, since these produce almost no waste when broken down, but they aim to move on to carrot power. "It has to be able to use raw materials, rather than giving it a refined fuel," says Melhuish.
   Inside the Walkman-sized battery, a colony of E. coil bacteria produce enzymes that break down carbohydrates, releasing hydrogen atoms. The cell also contains chemicals that drive a series of redox, or reduction and oxidation reactions, stripping electrons from the hydrogen atoms and delivering them steadily to the fuel cell’s anode(正极). This creates a voltage that can be used to power a circuit.
   To prove the MFC works, the researchers are using it to power a small light-sensitive robot. And when a number of the cells are connected in series, they could power domestic appliances, running a 40-watt bulb for eight hours on about 50 grams of sugar.
   Earlier MFCs were inefficient because they relied on energy-hungry filters and pumps. By experimenting with different anode materials, the UWE team have figured out how to make their system work: they dump the bacteria and redox chemicals directly into the cell.
   In its current form, the UWE team says its organic battery can produce eight times as much power as any previous MFC. But Melhuish wants to improve this, both by scaling it up and finding a better mix of redox chemicals.
Which of the following statement is NOT TURE according to the passage?
选项 A、The MFC is not a kind of new-developed fuel.
B、The MFC was not spread used in the past partly because of its high cost.
C、The MFC was proved to be able to power domestic appliance.
D、The previous MFC can produce eight times as much power as the current organic battery.
答案D
解析  在第二段开始提到，“Although such‘microbial fuel cells’(MFCs) have been developed in the past，they have always proved extremely inefficient and expensive．”虽然微生物能源电池早在过去已经得到发展，但是却被证明是非常无效及昂贵的。从这句可知，A，B是正确的。而在后面提到，“when a number of the cells are connected in series，they could power domestic appliances”所以C也正确。D选项应该是“organic battery can produce eight times as much power as any previous MFC”有机电池产生的能量是过去微生物电池的八倍，所以D不正确。
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