英语阅读理解,快,weallliveontheearth．Theearthturnsroundonceaday．Asitturns,somepeopleseesunsetandnightcomestotheirhouses．Theearthmovesinanotherway,too．Ifittravelsroundthesuninanorbit(轨道)towards(

　　英语阅读理解,快,

　　weallliveontheearth．Theearthturnsroundonceaday．Asitturns,somepeopleseesunsetandnightcomestotheirhouses．

　　Theearthmovesinanotherway,too．Ifittravelsroundthesuninanorbit(轨道)towards(向着)thesun,itissummeronthatpartoftheearth．Halfayearlater,theearthgoesroundtotheothersideofitsorbit．Thatpartoftheearthisnowfartherawayfromthesun,andhasitswinter,andtheotherparthasitssummer．Betweensummerandwinter,bothhalvesoftheeartharethesamedistance(距离)fromthesun．Thentheyhavespringandautumn．Astheearthgoesroundinitsorbit,wehaveourfourseasonsgoonandon．

　　()46．Wecanseesunriseandsunsetbecause．

　　A．thesunisneartous

　　B．theearthturnsroundeveryday

　　C．thesungoesoutofthecloudsinthedaytimeandintothematnight

　　D．theearthmovesroundthesun

　　()47．Therearefourseasonsinayearbecause

　　A．theearthmovesroundthesun

　　B．thesunturnsroundtheearth

　　C．thesunmovesfromoneplacetoanother

　　D．theearthtravelsnearerandnearertothesun

　　()48．Whentheearthgoesroundthesun,wehaveonthepartthatistowardsthesun．

　　A．springB．summerC．autumnD．winter

　　　()49．Whenwehavewinter,thepartoftheearththatwestandonis．

　　A．nearthesun

　　B．nearertothesun

　　C．fartherawayfromthesun

　　D．thesomedistanceastheotherpartfromit

　　()50．Whenbothhalvesoftheeartharethesamedistancefromthesun,wehave．

　　A．springandautumnB．springandwinter

　　C．summerandwinterD．summerandantumn