分析主谓宾...Whenalightpassengerplaneflewoffcoursesometimeago,itcrashedinthemountainsanditspilotwaskilled.Theonlypassengers,ayoungwomanandhertwobabydaughters,wereunhurt.Itwasthemiddleofwinter.Snowlaythickontheground.Thewomanknewthatthenearestvillagewasmilesaway.Whenitgrewdark,sheturnedasuitcaseintoabedandputthechildreninsideit,coveringthemwithalltheclothesshecouldfind.Duringthenight,itgotterriblycold.Thewomankeptasnearasshecouldtothechildrenandeventriedtogetintothecaseherself,butitwastoosmall.Earlynextmorning,sheheardplanespassingoverheadandwonderedhowshecouldsendasignal.Thenshehadanidea.Shestampedouttheletters‘SOS'inthesnow.Fortunately,apilotsawthesignalandsentamessagebyradiotothenearesttown.Itwasnotlongbeforeahelicopterarrivedonthescenetorescuethesurvivorsoftheplanecrash.