[单选] 31岁男性因呼吸困难被送到急诊科就诊。他有哮喘病史，有多次哮喘发作需要插管维持气道。他没有依从为这种情况开的药物。体格检查显示一名年轻男子极度痛苦。他房间的空气氧饱和度是87%。除给氧外，沙丁胺醇应通过下列哪一种途径立即给药？A 31-year-old man is brought to the emergency department complaining of dyspnea． He has a history of asthma and has had multiple asthma attacks requiring intubation for airway maintenance． He is noncompliant with his medications prescribed for this condition． Physical examination reveals a young man in acute distress． His room air oxygen saturation is 87%． In addition to administration of oxygen， immediate drug administration of albuterol should be administered by which of the following routes？