In the most serious cases, a food allergy can cause anaphylaxis (过敏症). This is a sudden, tion in which several problems occur all at once and can involve the skin, breathing, digestion, the heart and blood vessels. A person's blood pressure can drop, breathing tubes can narrow and the tongue can swell. People at risk for this kind of reaction have to be very careful and need a plan for handling emergencies, when they might need to get special medicine to stop these symptoms from getting worse.

　　What Will the Doctor Do?

　　If you think you may be allergic to a certain food, let your parents know. They will take you to the doctor to get it checked out. If your doctor thinks you might have a food allergy, he or she will probably send you to see a doctor who specializes in allergies. The allergy specialist will ask you about past reactions and how long it takes between eating the food and getting the symptom, such as hives. The allergist also may ask about whether anyone else in your family has allergies or other allergy－related conditions. The allergist may also want to do a skin test. This is a way of seeing how your body reacts to a very small amount of the food that is giving you trouble.语篇解读：本文是一篇说明文。主要介绍了食物过敏症的一些知识包括食物过敏症的症状及其应对措施等。your immune system ________．icals to remove harmful things in a certain food

　　解析：选B　细节理解题。根据第三段最后一句“But if you have ... dangerous to you.”可知当你过敏时你的免疫系统会误认为某种食物中的某种物质是有害物质而产生抗体。故选B项。following may happen?

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