Youmighthaveheardofcollisionsbetweencars,trainsandships,butsatellites?Itsoundslikesomethingfromamovie!Butsometimeslifecanbe1thanthemovies.OnFebruary11,aRussianmilitarysatellite,Kosmos2251,smashedintoaUScommunications

　　Youmighthaveheardofcollisionsbetweencars,trainsandships,butsatellites?Itsoundslikesomethingfromamovie!Butsometimeslifecanbe1thanthemovies.OnFebruary11,aRussianmilitarysatellite,Kosmos2251,smashedintoaUScommunicationssatelliteabout780kmaboveSiberiainRussia.The2mademorethan500piecesofdebris.

　　Thedebriscouldbevery3fornearbyspacecraft,evenatinypiececoulddogreatharm.Theaccidentoccurredinanorbitwhichmanysatellitesandotherspacecraft4.Itmeansthatsomecountriesmayhaveto5theirspacecraftintodifferentorbits.Itisthefirstsatellitecrashthathasbeenmade6.Peopleareworried,sincetheyunderstandhow7Earth’sorbithasbecomeinrecentyears.Beforetheaccident,therewerealreadyover300,000objects8theEarth.Therearesatellites(oldandnew),spacecraft,and9objects.TheUSandRussiahaveputthe10numberofobjectsinspace.Bothcountriesarecallingoncuttingspacejunk.Theyareaskingforinternationalcooperationtohelpsolvetheproblem.

　　1.A.worseB.strangerC.harderD.better

　　2.A.accidentB.satelliteC.spacecraftD.area

　　3.A.importantB.interestingC.dangerousD.difficult

　　4.A.useB.produceC.prepareD.share

　　5.A.moveB.makeC.reduceD.fix

　　6.A.famousB.publicC.successfulD.rapid

　　7.A.crowdedB.excitedC.developedD.touched

　　8.A.pullingB.circlingC.joiningD.pushing

　　9.A.anotherB.othersC.otherD.theother

　　10.A.largestB.smallC.sameD.bigger