单选题：用硝酸甘油治疗心绞痛时舌下给药的目的是

题目内容：
用硝酸甘油治疗心绞痛时舌下给药的目的是 A．避免肝脏损害
B．加速药物的分布
C．避免药物被胃酸破坏
D．避免药物的首过消除并加速药物吸收
E．减轻药物对胃肠道的刺激

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Historical weather data are necessary inA．the persistence method and the trends

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