A. less blood hemoglobin than a boy should B. the same amount of blood hemoglobin as a boy should C. more blood hemoglobin than a boy does D. at least 12 grams per 100 milliliters
参考答案:A 答案解析:根据第一段倒数第二句“Is should contain at least ll grams per 100 milliliters of blood for a girl and at least