More and more local small farms are popping_up in opposition to factory farms.

　　Today's commercial farms do not fit the image that comes to mind while happily singing along to Old MacDonald. Instead,

　　most

　　of the

　　nation's

　　food

　　comes from

　　CAFOs, Concentrated Animal Feeding Operations, where animals are

　　kept in tightly enclosed conditions as they are fattened up and

　　readied to be killed for food.

　　Fortunately, knowing exactly where one's food comes from

　　has led to an increase in the availability of what is known as

　　“grass­fed” beef.

　　Technically, all cattle are grass­fed for at

　　least a limited amount of time,

　　but what makes the meat

　　significant is that it is grass­finished, not force­fed corn, soy or

　　grains. This change in diet makes all the difference since corn is

　　not part of the cow's traditional diet, and therefore causes major health issues for it. To deal with the health issues, antibiotics (抗生素) are used and some of the antibiotics used to treat the cattle

　　are similar to those given to humans, so they can decrease the

　　effectiveness of medicine when a consumer is sick.

【2017届湖北专版高考英语一轮复习讲义：Unit2《Workingtheland》（新人教版）必修4（课前基础导练+课堂互动探究+课后知能提升）】相关文章：

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