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Three former executives of Archer-Daniels-Midland Co.--Michael Andreas, Terrance Wilson and Mark Whitacre--pleaded not guilty to federal criminal charges that they conspired to fix prices for the feed additive lysine. A Japanese executive indicted on similar charges failed to appear. . . . Britain’s Airtours and its U.S. cruise partner, Carnival Corp., agreed to buy Italian cruise line Costa Crociere for about $301 million.