关于吗啡抑制呼吸的叙述错误的是
A．肺通气量减少
B．潮气量降低
C．降低呼吸中枢对CO2敏感性
D．呼吸频率增加
E．呼吸频率减慢
参考答案：D
高雅的情趣有什么积极作用？
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Tell John not to leave the house________he makes sure that all the lights are turned off.[ ]
A. unless
B. if
C. once
D. because
