RobertisnineyearsoldandJoannaisseven.TheyliveatMountEbenezer.Theirfatherhasabigproperty.InAustraliatheycallafarmaproperty.RobertandJoannalikeschoolverymuch.Atschooltheycantalktotheirfriends,butRobertandJoannac

　　RobertisnineyearsoldandJoannaisseven.TheyliveatMountEbenezer.Theirfatherhasabigproperty.InAustraliatheycallafarmaproperty.

　　RobertandJoannalikeschoolverymuch.Atschooltheycantalktotheirfriends,butRobertandJoannacannotseetheirfriends.Theylive100,perhaps300,milesawayandlikeRobertandJoanna,theyallgotoschoolbyradio.

　　MountEbenezerisinthecentreofAustralia.Notmanypeoplelivein"TheCentre".Therearenoschoolswithdesksandblackboardsorteachersin"TheCentre".Schoolisaroomathomewithatwo-wayradio.Theteacheralsohasatwo-wayradio.Everymorningshecallseachstudentontheradio.Whenallstudentsanswer,lessonsbegin.

　　Thinkofyourteacher300milesaway!

　　21.Thechildrenin"TheCentre"donotgotoaschoolbecause______.

　　A.theylivetoofarawayfromoneanother.B.theydonotlikeschool.

　　C.theyarenotoldenoughtogotoschool.D.theirfamiliesaretoopoor.

　　22.Inordertosendtheirchildrentoschool,parentsin"TheCentre"ofAustraliamusthave______.

　　A.aproperty.B.acar.

　　C.aschoolroomathome.D.aspecialradio.

　　23.Teachersin"TheCentre"ofAustraliateach______.

　　A.notinaclassroombutatthehomesofthestudents.

　　B.byspeakingonlyandnotshowinganythinginwriting.

　　C.withoutknowingwhetherthestudentsareattending.

　　D.teachthestudentsfacetoface

　　24.Whenchildrenarehavingalesson,theycanheartheirteacher.

　　A.buttheirteachercannothearthem.

　　B.andtheirteachercanhearthemtoo.

　　C.butcannotheartheirschoolmates.

　　D.andseehimorheratthesametime.

　　25.A"Property"inAustraliaisa

　　A.house.B.school.

　　C.farm.D.radio.