Final answer:
Glucose, fructose, and galactose are common monosaccharides and sources include plant sweeteners, fruits, honey, dairy products, legumes, and avocados. Glucose and galactose are aldohexoses and fructose is a ketohexose.
Step-by-step explanation:
Three types of monosaccharides are D-glucose, D-galactose, and D-fructose.
Two sources of D-glucose are corn sugar and grape sugar.
Two sources of D-galactose are lactose and galactose.
Two sources of D-fructose are fruits and honey.