刘先生,50岁,有吸烟史,咳嗽2个月,咯血或痰中带血2周,胸片示左肺上叶有1.5×2cm病灶,病人入院后入睡困难,易觉醒。引起病人睡眠不佳的主要原因是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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