First of all, look at the color of oranges. Generally, the darker the color, the more vitamins and sweetness there will be. This is because sunlight is enough to prove it.
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Secondly, it is the softness of the skin. Some oranges are thick and hard to the touch, and most of them are not fully mature. You should choose something that feels smooth and won't be hard to pinch. Sweetness is absolutely enough.
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Cut it off. If there is no water in it and the color is dark, don't buy it. This is a long time, which is neither nutritious nor a waste of money. The picture is bright in color and full of water.
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Weighing the weight, generally, because the water is fresh enough, it will be heavier, so we can choose it by comparison. This is a very practical method and the effect is better. The picture says that we can use our hands in reality.
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Smell it. Do you know that fresh fruit will give off a sweet and greasy taste? It is as sweet as sugar, but it has a unique fruit flavor. You can try it at the place where it is sold. If you can't smell it, go to another house.