câu 1:Giữ da sạch bằng cách nào?Cần bảo vệ như thế nào? câu 2: Hoàn thành bảng 42.1 trong SGK trang 134 để chỉ những hình thức em cho phù hợp với rèn luyện da câu 3: Hằng ngày em đã có những biện pháp nào để rèn luyện da? câu 4:Nêu nguyên nhân của bệnh ngoài da? Nêu Cách phòng bệnh ngoài da?Cách chữa bệnh như thế nào?

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