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food ingredients. 35 prehistoric times,some food production skills,like smoking and salting meats for long-term storage,have been used.In the 19th century,canning 36 (become)a popular method for food production.Home cooks sometimes use tradi- tional food production skills 37 (produce)food for their fam- ilies. Though food production skills make food products have long shelf lives,they also have disadvantages.During high-tempera- ture processing,for example,raw foods lose nutrients.Food production industries also add artificial colors to make food 38 8 (attract).Although governments test all these artificial things,many people question 39 it is totally safe to use them too much in food.