临近中考，小敏妈妈为她拟定的食谱为：米饭，红烧肉、清蒸鱼、豆腐、牛奶．从营养均衡的角度，应该增加的食物是（ ）
例：If I were in your position，I would pay close attention.
→Were I in your position，I would pay close attention.
给农作物施用下列一种化肥就能增加两种营养元素，这种化肥是（ ）
