题目内容：
根据下列材料，请回答题：Pilot Cabuk was at the control seat calling out his climb checklist after taking off．Keeping him company in the copilot’S seat was the plane’S owner，Doug White．
Cabuk began a____36______call to air traffic controllers in Miami，but____27______his voice lowered and his head fell to his chest．White____38______ him on the shoulder and tried____39______ him awake，but he was still．The plane was a mile above the earth，climbing up at a speed of 2，000 feet per mi-nute．And no one on board knew___40_______to get it safely to the_____41_____．
white got on the radi0．“Miami，”he said in a trembling(颤抖的)voice，“I’ve got to_____42_____ an emergency(紧急状态)．My pilot fell ill and is in a terrible state．I need____43_____ uphere．”
Nate Henkels took the ____44______ at the Miami center．He was______45____;few aircraft had been as large as this one．Henkels instructed White t0 ___46_______ at the height of l2．000 feet．But the plane kept_____47_____．“Don’t worry．Pull back gently．”Henkels said，fighting his own ____48______．
The“gently”part proved _____49_____ ．White turned left and moved around．which ____50______him on the proper course．“You’re doing well，”said Henkels．His _____51_____ voice had become White’s lifeline．Gradually white ____52______the plane and then dropped the landing gear(起落架)．Fifteen minutes later，the plane was ____53______ 0n the runway，shining under the Florida sun after a perfect____54______ ．Inside the Miami control center，____55______broke out．
A．warning
B．particular
C．nervous
D．regular
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