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. Microbial fuel cells.
B. Cost-efficient microbial fuel cells.
C. The efficiency of microbial fuel ceils.
D. Organic battery runs robot.
更多"Passage Three
Scraps of f"的相关试题:
[单项选择] Passage Three
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. feed domestic animals
B. make garden compost
C. produce electricity
D. manufacture bacteria
[单项选择]
Passage Three
Could the bad old days of economic decline be about to return Since OPEC agreed to supply-cuts in March, the price of crude oil has jumped to almost $ 26 a barrel, up from less than $10 last December. This near-tripling of oil prices calls up scary memories of the 1973 oil shock, when prices quadrupled, and 1979 1980, when they also almost tripled. Both previous shocks resulted in double-digit inflation and global economic decline. So where are the headlines warning of gloom and doom this time
The oil price was given another push up this week when Iraq suspended oil exports. Strengthening economic growth, at the same time as winter grips the northern hemisphere, could push the price higher still in the short term.
Yet there are good reasons to expect the economic consequences now to be less severe than in the 1970s. In most countries the cost of crude oil now accounts for a smaller share of the price of petrol than it did in the 1970s.
A. global inflation,
B. reduction in supply.
C. fast growth in economy.
D. Iraq’s suspension of exports.
[单项选择] Clone Farm Factory farming could soon enter a new era of mass production. Companies in the US are developing the technology needed to "clone" chickens on a massive scale, once a chicken with desirable traits has been bred or genetically engineered, tens of thousands of eggs, which will hatch into identical copies, could roll off the production lines every hour. Billions of clones could he produced each year to supply chicken farms with birds that all grow at the same rate, have the same amount of meat and taste the same. This, at least, is the vision of the US’s National Institute of Science and Technology, which has given Origen Therapeutics of Burlingame, California, and Embrex of North Carolina $ 4. 7 million to help fund research. The prospect has alarmed animal welfare groups, who fear it could increase the suffering of farm birds. That’s unlikely to put off the poultry industry, however, which wants disease resistant A. Eggs are all genetically engineered. B. Thousands of eggs are produced every hour. C. Cloned chickens are bulk-produced with the same growth rate, weight and taste. D. Identical eggs can be hatched on the production lines.
[填空题]I hope I could fly to America as soon as I could.
I hope I could fly to America as soon as ______.
[单项选择]
[听力原文]
Electrical devices could soon use power made by human energy. Scientists say they have developed an experimental device that produces electricity from the physical movement of a person walking. British scientist Max and other scientists in Canada and the United States developed the device.
The device connects to a person’s knee. As the person walks, the device captures energy each time the person slows down. The movements of the walking person push parts of a small machine that produces electricity. Using the device, 22an adult walking quickly could produce thirteen wars of electricity in just a minute. Max says walking at that speed could produce enough power to operate a laptop computer for six minutes.
There are several possible uses for the device. Developers say it could help people who work in areas without electricity to operate small computers. 23The device could also be used in hospitals to operate heart pacemakers; it c
A. Helping housewives operate the washing machine.
B. Making it much easier for us to go online.
C. Producing more electricity than that invented by Larry Rome.
D. Being applied in medical fields to operate heart pacemakers.
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