dcabd

　　56.whenthewesternhemisphereishavingday,theeasternhemisphereishaving______.

　　a.bothdayandnightb.dayc.neitherdaynornightd.night

　　57.aplaceismovedfromdayintonightandfromnightintodayoverandoverby______oftheearth.

　　a.thepushingb.thepullingc.thespinningd.thepassing

　　58.attheequatordayisaslongasnight______.

　　a.sometimesb.neverc.usuallyd.always

　　59.whenthenorthpoleistiltedtowardthesun,thenorthernhemispheregets_____sunlight.

　　a.lessb.morec.alld.no

　　60.whenitiswinterinchina,______.

　　a.theusaistiltedtowardthesunb.thesouthpoleistiltedawayfromthesun

　　c.thenorthpoleistiltedtowardthesund.thenorthpoleistiltedawayfromthesun