患者男性,25岁。因外出春游去植物园,出现咳嗽、咳痰伴喘息1天入院。喘息貌,口唇发绀,在肺部可闻及广泛哮鸣音。医疗诊断是支气管哮喘,下面哪种是控制症状的首选药?( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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