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【单选题】
患者,男,57岁,既往有支气管哮喘史。一前接触刺激性气体后出现发作性喘息,伴咳嗽及活动后胸闷,医院以“支气管哮喘急性发作”收入院。入院后除给予激素,氨茶碱治疗外,还可以给予小剂量肾上腺素注射用于扩张支气管平滑肌,这是因为肾上腺素可以 :A.
激动β1受体
B.
激动β2受体
C.
激动α受体
D.
阻断α受体
E.
阻断β受体
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