A 6-year old boy with 2 years history of asthma has well controlled under inhaled steroid for 3month. A moment ago，he felt breathlessness and begun wheezing after activity， which medication does he need most urgently?

  • A: Inhaled corticosteroid
  • B: Systemic Corticosteroids
  • C: Leukotriene modifiers
  • D: Inhaled Rapid-Acting Beta2-agonists
  • E: Oral Rapid-Acting Beta2-agonists

答案：

解析：

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