This is my home. We have three bedrooms, a living room, a kitchen and a bathroom. In the kitchen, there is a fridge. The vegetables and fruit are in the fridge. The juice is in it, too. In my bedroom, there is a bed, a chair and a computer. Now I'm watching TV in the living room. Mum is cooking in the kitchen. My sister is taking a shower in the bathroom. Our cat is under my bed.

①教育是文化传播的重要手段

②教育是文化发展的重要因素

③教育是做好垃圾分类的关键

④教育有利于社会主义精神文明建设

长期以精米、精面为主食而又少吃水果、蔬菜的人，唇和口腔溃疡(俗称“烂嘴”)的原因是人体内缺乏(    )

关于我国优越地理位置的说法，不正确的是（    ）