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What do you eat before the exam that can best concentrate your attention?
Better eat raisins!

Many dried fruits have their unique skills to promote human health, and the nutrients contained in raisins are even more amazing to nutritionists. A recent study by American nutritionists shows that if you eat raisins equivalent to 400 calories a day, you can effectively lower cholesterol in the blood and inhibit the oxidation of bad cholesterol in the blood. In addition, raisins can improve the health of the rectum, because raisins contain fiber and tartaric acid, which can make excreta pass through the rectum quickly and reduce the time for dirt to stay in the intestine. So I can concentrate on the exam.