Facility agriculture refers to agriculture that uses man-made facilities to improve or create environmental meteorological factors in a local area to provide good environmental conditions for plant growth for efficient production. It is a high-tech industry and one of the most dynamic industries in the world today. Which of the following is not a facility agriculture? ['Bashang sheep-raising industry changed from traditional sheep-raising to scientific sheep-raising.', 'Since the beginning of spring, farmers in northern counties and mountainous counties have covered corn with plastic film.', 'Baoding Shunping County uses greenhouses to grow strawberries, so that people can eat fresh fruits in the cold winter.', 'Relevant counties and cities in the capital of our country play the role of water conservancy infrastructure and grow vegetables to supply the Beijing market.']