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oe betterudinrnth COVID-19 lkn?A.TeenagersYounger adults..Older adults.D.Middle-aged men.0.What behindtheovel levof erhigher expAdded spare time.B.Higher income.C.Concern for health.D.Better education.31.What can we know from the last paragraph?A.The more one earns,the less he works out.B.The busier one gets,the more he works out.CThe older one becomes,the less he works out.D.The less freedom one has,the more he works out.DAbout 750 million people in the world do not have access to electricity at night.Solarcl provide power during the day,but saving eergy for ater use requires masibaterystorage..ResearcerfromSfor Universiyhotv(光伏发电)cell thatharvests ergyfrom the roenduring the day and night,avoiding the eedforbatteries altogether.The device makes use of the heat leaking from Earth back into space.At night,solarcells radiate(and lose heat to the sky,reaching temperatures a few degrees below thesurrounding air.The device under development uses a thermoelectric module(热电组件)togenerate current from the temperature difference between the cell and the air.This processdepends on the thermal design of the system,which includes a hot side and a cold side.The setup is inexpensive and,in principle,could be combined within existing solar cells.It is also simple,so construction in remote locations with limited resources is possible.Using electricity at night for lighting requires a few watts of power.The current devicegenerates 50 milliwatts per square meter,which means lighting would require about 20 squaremeters of photovoltaic area."None of these components were specifically engineered for this purpose,"said authorShanhui Fan."So,I think there's room for improvement,in the sense that,if one really engi-neered each of these components for our purpose,I think the performance could be better."The team aims to optimize (the thermal insulation and thermoelectric componentsof the device.They are exploring engineering improvements to the solar cell itself to promotethe radiative cooling performance without influencing its solar energy harvesting capability.32.What is the biggest advantage of the new solar device over the traditional one?A.It doesn't need battery storage.B It is easy to control.C.It is light to move.colleets more energy.33 What is the meaning of the underlined wordein paragraph?A.The movement of water in the sea.The w of elertyhoh【高二英语第6页（共10页）】·22-05-480B·