Thousandsofyearsagopeopledidn’tknowthattheEarthmoved.Theythoughtthesunreallydidmoveacrossthesky.TheGreekgodHelioswassaidtodrivethesunaroundtheskywithhischariot（战车）.Butnowtheseideashaveallchanged.Nowadaysitisthesunthatdrivesour“chariot”aroundthesky.
Sowhatdoesallthismean?Wellquitesimplythereisnowaplane（or“chariot”）thatispoweredbythesun.Ithasspecialpartsinitswings.Thesepartsabsorbpowerfromthesun.Theyabsorbsomuchpowerthattheycancarryonflyingatnight.IntheGreekmyths（希腊神话）Helioshadtotakeabreakatnight.Itseemswe’refinallyevenmoreefficientthanthegodsthemselves.
ThisplaneiscalledSolarImpulse（“太阳驱动”号）.ItwillflyacrosstheUSinMay.Thisisveryimportantforthefutureoftheworld.
Sowhyissolarenergysogoodforus?Wellotherkindsofenergycauseafewproblems.IfyouliveinChinayou’veprobablynoticedthepollution.Thisiscausedbyburningcoalorgastomakeenergy.Theheatandchemicals（化学制品）fromthismakethingswork.Butifweusetheheatfromthesunwedon’thavetoburnanythingandthere’snopollution.
Solarenergyisnotallthereyet.Itneedstobeimproved.Butthebestthingaboutitisthatunlikecoalandgasitdoesn’trunout.SolarImpulsecouldkeepflyingforever.Wellactuallythesunwillrunouttooonedaybutnotforanother5billionyears.That’saprettylongflight.
小题1:Whatdoes“chariot”reallyrefertointhelastsentenceofParagraph1?
