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made meto startestionse way.ay two8Why was the Saihanba Mechanical Forest Farm setupA.To block sandstorms.aveled29C.To plant more crops.What can we learn from the story of SaihanbaB.To deal with droughts.33.What can weA.Saihanba has been a royal retrea fo years.D.To attract tourists.A.It lacksC.It pioneave aB.It is the Saihanba Sprit that makes Saihanba what it34Why doesCThe forestersaysmeethremnoA.To preD.The first foresterntSaihanba ere quipped with the best toosC.To ma30.What does the underlined word"uin the last paragraph mean?35.What canA.Having a lot of healthy grass or plants.A.It hasB.Having a lot of hard sand and rocks.B.It covC.Having a lot of clean water resources.C.It stilD.It asD.Having a lot of crops and fruit trees.31.What's the purpose of this text?第二根据短A.To recommend a travel destination.EveryB.To call on us to fight against deforestation.world.BeaC.To introduce the beautiful scenery of Saihanba,to stay fas:D.To introduce transformation and the spirit of Saihanba.style in achanges.DAstronomers in the future may not be able to build large power-hungry observatories(13th文台)if they want to reduce their carbon footprint in line with greenhouse gas emission(排放)Beatrequirements,a study suggests.poems oIn a-new study,a team of researchers from the Institute for Astrophysics and Planetologyperiod.Research (RAP)in Toulouse,France,found that the world's cutting-edge astronomical16tobservatories generate over their lifetime about 22 million tons of carbon dioxide.That valueIdeequals the yearly carbon emission of some small European countries.This value involves thelook lilcarbon emission generated during the construction period as well as the operation time.eyebro"No study has ever tried to estimate the carbon emissions in this respect,"AnnieHughes,an astronomer at IRAP and one of the authors of the paper,said in the newsconference..“So the results in our paper are the first quantitative(定量性的)estimate for theand dcarbon footprint associated with those observatories.an alTo estimate the carbon footprint,the astronomer used a method called'the economicinput-output analysis."We believe that greenhouse gas emissions of astronomical researchequipment are proportional(成比例的)to its costs or weight,”said Jurgen Knodlseder,alsoaharrlead author of the study."To understand that,just think about what happens when youbobdouble the amount of fuel that you fill in your car's gas tank.It will cost you twice as much,and when you dry your gas tank empty,you will emit twice as much greenhouse gas."This cost-based estimate,however,comes with a huge 80%uncertainty,the researchersadmitted.A more accurate()method of estimating the carbon footprint of astronomyresearch equipment would be the life-cycle assessment,which would,however,requiredetailed data on each of the projects.This data,however,is usually not available due toindustrial secrecy reasons.Regardless of the defect()of the estimate,the scientists said that the astronomicalcommunity will have to reduce the carbon footprint by up to 20%if it wants to meet globalemission reduction goals.32.What is the recent study mainly about?A.Astronomers in the future.B.Greenhouse emissions of observatories.C.Various ways to cut down the carbon footprint.D.Strict greenhouse gas emission requirements.【高二期中测试·英语第5页（共8页）】
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