VOA慢速英语2012.12.17 成本, because, burned, 的, 动物

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Animal feed is the biggest cost for most cattle producers. In the United States, the cost of hay, grains and other feed has risen sharply because of a drought. At the same time, wildfires this year burned more than a million hectares of North American rangeland.对多数养牛人来说,动物饲料的成本最高.由于干旱,美国干草、谷物和其它饲料的成本急剧上升.与此同时,野火今年烧毁了1百多万公顷的北美牧场.
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