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A farm worker drives cattle in Argentina's Entre Rios province,  northeast of Buenos Aires, Saturday, Dec. 1, 2007. Argentines are passionate about their beef - from cattle grazed on the sprawling pampas grasslands, it's a national staple, delivered inexpensively and received with religious fervor at Sunday barbecues nationwide.  But while Argentines are some of the world's top meat-eaters, consuming nearly 154 pounds per capita each year, soaring grain prices and export caps are driving many ca