Final answer:
The main idea of the paragraph is to follow the doctor's advice for treating injuries.
Step-by-step explanation:
The main idea of the paragraph is that it is important to follow the doctor's advice to treat injuries. The paragraph provides recommendations for taking care of a head injury, such as resting for two weeks, washing the wound properly, and not covering the wound. This emphasizes the significance of following the doctor's instructions to promote healing.
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