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  3. What cows constitutes high percentage in the total cows butchered each year? Why will Americans want to export beef from animal

What cows constitutes high percentage in the total cows butchered each year? Why will Americans want to export beef from animal

admin2009-04-23  101
问题 What cows constitutes high percentage in the total cows butchered each year?
Why will Americans want to export beef from animals under thirty-month-old?
选项 A、Because no case of BSE has been found in cattle under thirty-month-old.
B、Because cattle under thirty-month-old are immune from BSE.
C、Because cattle under thirty-month-old are not from Canada
D、Because this will soothe Japanese fears about BSE.
答案A
解析 根据题干中export beef from animals under thirty-month-old，可以定位到第四段第六、七两句话。根据这两句话可知美国派人到日本与他们商谈向日本出口牛肉的事宜，而这些牛肉都是出自小于30个月大的小牛。一位牧业专家Steve Kay指出疯牛病从未在小于30个月大的小牛中发现过。也就是说，美国想向日本出口小于30个月大的小牛的牛肉，是因为在这些小于30个月大的小牛中从未发现疯牛病。文中没有提及小于30个月大的小牛对疯牛病能免疫，故可排除B；文中没有提及小于30个月大的小牛不是来自加拿大的，故可排除C；这能减轻日本对于疯牛病的恐惧，是美国派人去日本的目的之一，但并非美国出口30月之内大的小牛的原因，故可排除D。
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