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【单选题】
患者，男，75岁。诊断为慢性肺心病，住院期间给予持续低流量吸氧，其原因是（）。A.
避免高流量O对呼吸道的损伤
B.
避免高流量O引起呼吸道分泌物干燥
C.
有利于CO及酸性代谢产物的持久释放
D.
保持CO对呼吸中枢的长久刺激作用
E.
维持缺氧对呼吸中枢的兴奋作用
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