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person's energy."The best way to reduce stress hormones is to use the energy,she says.28.What is Paragraph 2 mainly about?A.research applicationsB.research backgroundsC.research contentsD.research results29.What should we do if we want to feel less stressed?A.Share as many photos as possible.B.Listen to music frequently on social media.C.Give more positive comments to others.D.Communicate less with others on Facebook30.What is Wenhong Chen's attitude towards Lupien's study?A.CautiousB.Critical.C.Doubtful.D.Approving.31.What can be learned from Lupien's suggestion?A.There are many dangers on social media.B.Doing physical exercise helps reduce the levels of cortisol.C.Sharers on Facebook live a happier life than watchers.D.Getting support from e-friends makes us healthier.DCurtin University research has found a simple and affordable method to determine which chemicals and types ofmetals are best used to store and supply energy,in a breakthrough for any battery-run devices and technologies relying onthe fast and reliable supply of electricity,including smart phones and tablets.Lead author Associate Professor Simone Ciampi from Curtin's School of Molecular and Life Sciences said this easy,low-cost method of determining how to produce and keep the highest energy charge in a capacitor could be ofgreat benefit to all scientists,engineers and start-ups looking to solving the energy storage challenges of the future."All electronic devices require an energy source.While a battery needs to be recharged over time,a capacitor can becharged instantly because it stores energy by separating charged ions(),found in ionic liquids,"Ciampi said.There are thousands of types of ionic liquids,a type of "liquid salt",and until now,it was difficult to know whichwould be best suited for use in a capacitor.What our team has done is designing a quick and easy test,able to be performedin a basic lab,which can measure both the ability to store charge when a solid electrode touches a given ionic liquid-asimple capacitor-as well as the stability of the device when charged."The simplicity this test means anyone can apply it without the need for expensive equpment.Using this method,researchers found that charging the device for 60 seconds produced a full charge,which did not 'leak'()and begin todiminish for at least four days,"Mr Belotti said.The next step is to use this new screening method to find ionic liquid with an even longer duration in the charged stateand larger energy density.32.What can the new method be used to do in the future?A.Help to choose smart phones.B.Find materials used as energy.C.Research energy sources of the future.DSettle the problem of storing energy.英语试题第5页/共9页