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【单选题】
关于呼吸的描述，正确的是
A.
安静状态下，正常成人的呼吸频率是12～18次/分
B.
正常呼吸表现为节律规则，均匀轻声，不费力
C.
婴幼儿、男性呼吸频率稍快，而老年人和女性稍慢
D.
呼吸的频率受意识控制，深浅不受意识控制
E.
情绪激动时呼吸频率稍慢，休息、睡眠时呼吸频率稍快
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