4．The simplistic claim that organic food is more nutritious than conventional food was always likely to be misleading．Food is a natural product，and the health value of different foods will Vary for a number of reasons including freshness，the way the food is cooked，the type of soil it is grown in the amount of sunlight and rain crops have received，and so on．Likewise． the flavor of a carrot has less to do with whether it was fertilized with manure(粪便)or something out of a plastic sack than with the variety of carrot and how long ago it was dug up．

　 5．Then notion that organic food is safer thannormalfood is also contradicted by the fact that many of our most common foods are full of natural toxins(毒素)．As one research expert says：People mink that the more natural something is．the better it is for them．That is simply not the case．In fact，it is the opposite that is true：the closer a plant is to its natural state，the more likely it is that it will poison you．Naturally，many plants do not want to be eaten，so we have spent 10，000 years developing agriculture and breeding out harmful traits from crops．

根据以上内容，回答23-30题。

Paragraph 1__________

A．Main reason for the popularity of organic food

B．Description of organic farming

C．Factors that affect food health value

D．Testing the taste of organic food

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