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23:02令ol69X百度网盘分享●0●suspension in the world.It spans 1,700 meters across the famous Yangtze River.The bridnotably has the world's longest double-level bridge span,accommodating various forms【高三英语第1页（共8页）】·24-3490C.She had much precious experience.28.VD.She was always very caring.25.Which of the following is the most important in Zandra's opinion?A.Sharing her personal interests.B.The diversity of hobbies.29.TC.Changing the global market.D.The need of customers.26.What kind of product does Zandra mainly pursue?A.The one that is cheap and useful.B.The one that is enjoyed by her mom.C.The one that is created by trial and error.30.D.The one that is reliable and eco-friendly.27.What is Zandra's attitude towards the future of her brand?A.Hopeful.B.Concerned.C.Doubtful.D.Relieved.31.WCMost air conditioners and fridges rely on contracting and expanding a liquid to eitherabsorb or release large quantities of heat.While these systems are relatively cheap and simpleto produce,they aren't very efficient and require lots of energy.Besides,many of the coolants(冷却剂)used are environmentally harmful.Now,Emmanuel Defay at the Luxembourg Institute of Science and Technology and hiscolleagues have developed a coolant-free refrigeration device made from the metals lead,Friescandium (and tantalum ()It can reach maximum efficiencies of more than 60%,contalmost double that of typical single-room air conditioning units.The technology is based on a70%principle called electrocaloric cooling,in which an electric field applied across a materialprovchanges the direction of electric charges,causing a temporary increase in temperature and athesucceeding decrease when the electric field is removed.To make their cooling system,Defay and his colleagues piled up eight strips of theincidmaterial known as lead scandium tantalate,which is electrocaloric,on top of one another andricedipped them in a heat-carrying liquid,silicone oil.When an electric field is switched on andmucthe strips heat up,the liquid moves to the right,and when it cools down,it moves to the left,impacreating permanent regions of hot and cold of about 20 C difference.These regions can beused as hot and cold reservoirs from which the oil can be circulated through pipes to cool or2 diaheat rooms or objects as desired.Dariu"Although the efficiency of the device is theoretically 67%,the efficiency of the currentareadesign is around 12%.This could be improved if a better conductor of heat than the leaddiabscandium tantalate were found,"said Defay."A highest performance has been achieved by combining known elements,"said NeilOf tMathur at the University of Cambridge.However,he added,the team only looked at thediabcooling power of the pile of metal strips themselves,while it would be interesting to see howfamthe entire device performs together.【高三英语第3页（共8页）】·24-349C·incidence in men versus women,in younger versus older adults,and in urban versus ruralresidents at the global level.Regionally,Central and Eastern Europe and Central Asia,4-1-1m-1-1.-1·-1泪目录模式播放云打印