A、7-yEAr-olD Boy is hospitAlizED with CystiC FiBrosis. to hElp him mAnAgE sECrEtions AnD AvoiD rEspirAtory DistrEss, thE nursE shoulD A、pErForm ChEst physiothErApy EvEry 4 hours. B、givE pAnCrEAtiC EnzymEs As orDErED、 C、plACE thE ChilD in An oxygEn tEnt AnD hAvE oxygEn ADministErED Continuously. D、sErvE A high-CAloriE DiEt.