2021年职称英语理工类试题

1、职称英语理工类试题 Sugar Power for Cell Phones Using enzymes monly found in living _lls，a new type of fuel _ll produ _s s _ll amounts of electricity from sugar.If the technology is able to sueed in _ss production，you _y some day share your sweet drinks with your _ll phone. In fuel _lls，chemical reactions gen

2、erate electrical currents.The pro _ss usually relies on precious metals，such as platinum.In living _lls，enzymes perform a similar job，breaking down sugars to obtain electrons and produ _ energy. When researchers previously used enzymes in fuel _lls，they had trouble keeping them active，says Shelley D

3、.Minteer of St Louis University1.Whereas biological _lls continually produ _ fresh enzymes，theres no mechani _ in fuel _lls to repla _ enzymes as they quickly degrade. Minteer and Ta _ra Klotzbach，also of St Louis University，have now developed polymers that wrap around an enzyme and preserve it in a

4、 microscopic pocket.“We tailor these pockets to provide the ideal microenviro _ent” for the enzyme，Minteer says.The polymers keep the enzyme active for months instead of days. In the new fuel Cell，tiny polymer bags of enzyme are embedded in a membrane that coats one of the electrodes.When glucose fr

5、om a sugary liquid gets into a pocket，the enzyme oxidizes it，releasing electrons and protons.The electrons cross the membrane and enter a wire through which they travel to the other electrode，where they react with.oxygen in the atmosphere to produ _ water.The flow of electrons through the wire const

6、itutes an electrical current that can generate power. So far，the new fuel _lls dont produ _ much power，but the fact that they work at all is exciting，says Paul Kenis，a chemical engineer at the University of Illinois2 at Urhana-Champaign3.“Just getting it to work.” Kenis says，“is a _jor aomplishment.

7、” Sugar-eating fuel _lls could be an efficient way to _ke electricity.Sugar is easy to find. And the new fuel _lls that run on it are biodegradable，so the technology wouldnt hurt the enviro _ent.The scientists are now trying to use different enzymes that will get more power from sugar.They predict t

8、hat popular products _y be using the new technology in as little as 3 years. 1. Aording to the first paragraph，when can we share our sweet drinks with our _ll phones? A When enzymes can be monly found in living _ils. B When the technology of producing a new type of fuel _ll appears. C When the technology of a new type of fuel _ll is suitable for _ss production. D Whe