1.How to prevent cold? ① Exercise to enhance physical fitness; ② Increase and decrease clothing in time; ③ Avoid contact with cold patients, do not go to public places during the epidemic, do not go to the patient’s home; ④ Open windows regularly to keep the indoor air fresh. 2.How to prevent hepatitis B? ① Vaccinate newborns against hepatitis B; ② Strengthen the management of blood and blood products; ③ Inject one person with one needle and one tube; ④ Advocate meal sharing system and a special toothbrush for individuals. 3.How to brush teeth correctly? The correct way to brush teeth is vertical brushing method, do not “saw-like” horizontal brushing. The vertical brushing method is: brush the upper teeth from top to bottom, brush the lower teeth from bottom to top, brush the occlusal surface back and forth, inside and outside, and brush for 3-5 minutes each time. Cross-brushing can cause some dental diseases, such as gum recession, root exposure, tooth neck defect, etc. Toothbrushes should use a health care toothbrush with a small head, soft bristles and an appropriate handle length. 4, the seven codes of pregnant women: ① to maintain emotional stability, happy spirit. If emotional instability, mental distress, brain secretion kinin disorder, the fetus is prone to malformations; ② be careful with drugs. Many drugs affect fetal growth and development and have teratogenic effects. If you have to use drugs because of illness, you must take them under the guidance of a doctor; ③ minimize the exposure to radiation. Do less or no X-ray or isotope examination; ④ Prevent viral infection. Pregnant women should go to fewer or no crowded public places and wear a mask when they must go; ⑤ Keep nutrition comprehensive and adequate. In addition to the daily diet, the focus should be on supplying eggs, fresh milk and its products, fresh vegetables, fruits and appropriate amount of meat that are highly nutritious and comprehensive and easy to digest and absorb; ⑥ Passive smoking should be strictly prohibited and avoided; ⑦ Alcohol should be prohibited. Pregnant women drink alcohol is one of the main causes of infant malformation and low intelligence. 5.What are the five colors of the table? (Red) If there is no contraindication, you can drink 50 to 100 ml of red wine every day, which helps to raise high-density lipoprotein, can activate the blood and prevent atherosclerosis. (Yellow) refers to yellow vegetables, such as carrots, sweet potatoes, pumpkin, tomatoes, watermelon, etc., which are rich in carotenoids and have an important role in improving immunity and reducing the chance of infection and tumor development in adults and children. Our national diet is generally lacking in carotenoids. (Green) refers to green tea and green vegetables. The best beverage is tea, and tea is better than green tea. According to the Chinese Academy of Preventive Medicine research found that green tea has a significant anti-tumor, anti-infection effect. Tea can also regulate the body and mind, temperament. (White) refers to oat flour or cereal. Daily consumption of grams of cereal can reduce blood cholesterol and triglycerides to a certain extent, especially for diabetics. (Black) refers to black fungus. Studies have found that consuming 5 to 15 grams of black fungus daily can significantly reduce blood viscosity and blood cholesterol levels and help prevent thrombosis.