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  3. Peanuts are one of the world’s most nutritious foods. Peanuts contain pound for pound more protein, vitamins, and minerals than

Peanuts are one of the world’s most nutritious foods. Peanuts contain pound for pound more protein, vitamins, and minerals than

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问题     Peanuts are one of the world’s most nutritious foods. Peanuts contain pound for pound more protein, vitamins, and minerals than beef liver and more fat than heavy cream. For 【B1】______ 0.5% of Americans, however, peanuts are not so【B2】______; in fact, they’re potentially deadly.
    Between 1 and 2% of American adults suffer from food allergies(过敏症). A food allergy occurs when particular proteins in certain foods cause an immune system response, resulting in various 【B3】______. Many foods can cause allergic reactions【B4】______ mild to severe, but peanuts cause fierce allergic【B5】______.
    People allergic to peanuts can experience a rapid heartbeat, and in the worst cases, death. Although only a small percentage of people have peanut allergies, they【B6】______ 50% of all food related deaths.
    It may seem unbelievable that so much harm can result from such a seemingly innocent, useful food. However, it’s the peanut’s usefulness that makes it so dangerous. Peanuts and peanut products are used in a wide variety of packaged foods, but are not always【B7】______ as an ingredient.
    Since it’s possible for even the slightest trace of peanut protein to cause an allergic reaction, these hidden ingredients can cause【B8】______ harm. In some cases, even kissing a person who’s just eaten a "peanuty" food can be dangerous.
    If you have a peanut allergy never【B9】______ that foods are made without peanuts. Call the manufacturer and find out. Also, before you move in for a kiss,【B10】______ that he or she is peanut free.
【B7】
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答案listed
解析 此空需填入过去分词，与空格前的arenot always一起构成被动语态，并与前面的areused对称。list“列举”，其过去分词直接在词尾加-ed。
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