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
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