“三明治陷阱”是指在成本大幅度提高和销售价格不断下跌的双向挤压下，实体企业利润（中间层）迅速变薄的经济现象。为应对该陷阱，企业应（  ）

①增加产品科技含量一提升品牌形象一获得市场认同

②提高企业劳动生产率一降低生产成本一提高市场份额

③扩大生产规模一寻找廉价要素替代一降低生产成本

④增大研发投入一提高商品价值量一避免低价倾销

My mother is a teacher of E____. She is very k____ to her students. She always h____ them with their lessons. After class she often t____ to them and l____ to them carefully. My mother loves her job and she is n____ be late for work. She goes to work on foot. It takes her h____ an hour to get to school. All the pupils in my class like her i____ class.