【单选题】
老年夫妇的角色也在发生着变化，丈夫退休后承担家务增多，由于缺乏家务经验，老两口经常吵架，这是由于（ ）导致的心理改变。
①
家庭经济状况问题
②
家庭人际关系问题
③
空槽老年人
④
丧偶老年人
【单选题】
老年人退休以后，与家人接触的时间增多，加上身体不适、家务琐事等诸多家庭事件增加，家庭矛盾也增多，这是由于（ ）导致的心理改变。
①
家庭经济状况问题
②
家庭人际关系问题
③
空槽老年人
④
丧偶老年人
【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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