Manhasinventedfourkindsofsatellites(卫星).Thefirstkindofsatellitestudiesthe 31 oftheearth.Theyareusedtomakemaps.Theyalsohelpcountriestoseewheretheymay 32 oilorgold.

Thesecondkindofsatelliteisusedtoguideshipsandplanes.Ashiporaplanecan 33 amessagetothesatelliteandthesatellitecanfindout 34 theshiportheplaneis.

Thethirdkindstudiestheweather.Thesesatellites35cloudsandstrongwindsmovingacrosstheearth.Theywarncountriestomakepreparations(准备)whenvery 36weatheriscoming.  37 kindisusedforcommunication.Telephonecalls 38 countriescanbesentbythesesatellites.Somecancarryhundredsofcallsatthesametime.Thecallissenttothesatellitethenthe 39sendsittoastationinthecountryandthiscountryisbeingphoned.Thesesatellitesalsocarrypictures;theycanreceiveandsendabouteight 40 atatime.

（）31.A.biology         B.history        C.physics     D.geography

（）32.A.study          B.find        C.carry           D.choose

（）33.A.write           B.send        C.take       D.bring

（）34.A.where           B.which          C.what        D.that

（）35.A.search          B.watch           C.notice          D.see

（）36.A.sunny           B.cool        C.fine       D.bad

（）37.A.Thelast        B.Another     C.One        D.Anyother

（）38.A.during          B.along           C.between     D.of

（）39.A.TV              B.telegraph       C.telephone       D.satellite

（）40.A.plays           B.programs   C.films           D.object