Youhaveprobablyheardofhomingpigeons(鸽子)whichusuallyappearedinwar.From3000B．C．tothepresenthomingpigeonshave1aspostmen.Theyhavebeenespeciallyusefulforcarryingmessagesintimeofwar.Thet

　　Youhaveprobablyheardofhomingpigeons(鸽子)whichusuallyappearedinwar.From3000B．C．tothepresenthomingpigeonshave1aspostmen.Theyhavebeenespeciallyusefulforcarryingmessagesintimeofwar.Thetelegraphisnot2tocarryabout.Sometimesonlythelittlepigeoncantakeamessagewhereitoughttogo.

　　In1870whenthePrussianssurroundedthecityofParisthecitywascutofffromallthe3meansofcommunication.Thepeople4manydifferentwaysof5news.Onewaywastoletgosmallballoonscarryingmail.6ofcoursetheyonlydrifted7thewindcarriedthem.Oftentheylandedinsidetheenemy'slines.Evenballoonslargeenoughtocarryapilotcouldhardlybewellcontrolled.

　　Itwaspigeonsthatintheendsolvedthe8.Homingpigeonswerebroughtinto9.Soontheywerecarryinglettersfarandwide.Theenemybought10tocatchpigeonsbutthelittlepostmencouldflyfasterthantheir11.Strangelyenoughpigeonsplayedanimportant12inwar.

　　DuringWorldWarIeveryarmyunithadagroupofpigeons13.Manyofthemwere14.AmongthemwasanAmericanpigeonwithaFrenchnameCherAmiwhichmeant“friend”.AgroupofU.S.soldiersweresurroundedbytheenemy.Theyhadnofoodandnobullets.Theynearlydiedof15Therewas16hopeforthem.CherAmimadehisway17thebulletsandsucceeded.Atonceplanessetouttodropfoodandammunition(军火)tothem.Withtheirstrength18thesoldiersfoughtbacktotheirownarmyandgotsaved.

　　19canpigeonscarrythemessage?Therewerevariousmethods.Usuallythemessageisputintoalittleglasstube.Thetubeistiedtothelegorhiddenunder20orhungaroundtheneck.

　　1．

　　[]

　　A．considered

　　B．served

　　C．regarded

　　D．made

　　2．

　　[]

　　A．easy

　　B．difficult

　　C．necessary

　　D．important

　　3．

　　[]

　　A．present

　　B．past

　　C．usual

　　D．ordinary

　　4．

　　[]

　　A．used

　　B．did

　　C．tried

　　D．managed

　　5．

　　[]

　　A．announcing

　　B．sending

　　C．carrying

　　D．telling

　　6．

　　[]

　　A．And

　　B．Though

　　C．Since

　　D．But