1. There are 17 to 20 kinds of oranges, and the common ones are sugar orange, tangerine, Gong Ju, Changxing Island orange, Huangyan orange, Zizania latifolia, navel orange, citrus and Four Seasons orange.

2. The orange is round, yellow and red in shape, with dense and thin skin, which is not easy to peel, and the juice is sweet; Vitamin A in oranges can also enhance people's vision in dark environment and treat night blindness. Oranges should not be eaten more. If you eat too much, you will get carotene, and your skin will be dark yellow, just like jaundice.