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