Your daughter, stung by a bee, breaks out in hives and seems short of breath. Earlier stings never caused an allergic reaction. What should you do? A: Apply antihistamine cream. B: Bathe her in baking soda to relieve the itching. C: Call for medical help.

A 7-year-old boy with a previous history of bee sting allergy is brought to the emergency department after being stung by 3 bees. If this child has signs of anaphylaxis, what is the treatment of choice?() A: Diphenhydramine<br/>(an antihistamine agent) B: Ephedrine C: Epinephrine D: Methylprednisolone<br/>(a corticosteroid) E: Phenylephrine

A 70-year-old man enters the hospital emergency department and has been experiencing severe diarrhea（腹泻）. He has pallor, tachycardia, and an arterial pressure of 80/50, and has trouble walking. Which of the following therapies would the physician recommend to prevent shock? A: Infusion of a balanced electrolyte solution B: Blood infusion C: Administration of an antihistamine（抗组胺药） D: Infusion of a sympathomimetic drug （拟交感神经药）