【单选题】【消耗次数：1】
以下检索式中，哪个能检索出“儿童”和“佝偻病”在同一字段中的文献（）
①
儿童 or 佝偻病
②
儿童 with 佝偻病
③
儿童 and佝偻病
④
儿童 not佝偻病
参考答案：
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【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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