The flu is a kind of common disease.It spreads easily among people.But we needn't be afraid of it.What should we do to prent it?First,we should eat healthy food and do more exercise to build up our bobies.Second,we should keep our rooms clean and often open the windows.Third,we should not go to crowded places.Finally,if we don't feel well,we should go to see a doctor at once.If we do so,we will keep healthy.
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