<svg width='1200' height='800' xmlns='http://www.w3.org/2000/svg'><rect width='100%' height='100%' fill='#8BC34A'/><text x='600' y='400' font-family='Arial' font-size='60' text-anchor='middle' fill='white'>水稻高产栽培技术 - 备用图片</text></svg>
