50岁男性,每年冬春季常有哮喘发作,近日来患感冒,并咳嗽,门诊测量血压升高,医生除给予抗感染治疗外,尚考虑给予降压药,其中欲选择一种β肾上腺素受体阻断药,请问下列哪种最为合适()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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