In A Large Skillet, Saute The Onion, Pepper And Corn In Oil Until Tender. Stir In Sausage And Lemon Juice; Heat Through. Spread 2 Tablespoons Refried Beans Over Each Tortilla. Spoon Sausage Mixture Down The Center Of Tortillas. Sprinkle With Cheese And Lettuce. Roll Up Tightly.