whAt DoEs thE DisCovEry oF DEEp-FrEEzE BACtEriA mEAn to us, ACCorDing to thE pAssAgE
A．wE might onE DAy FinD Form oF liFE on othEr plAnEts.
B．sCiEntists From nAsA mADE A grEAt progrEss in DisCovEring thE miCroorgAnisms
C．to rEtriEvE Any liFE thAt hAs DiED long Ago is impossiBlE.
D．AlAskA is A plACE ABunDAnt in miCroorgAnisms.