sentence1: McDonald's has announced slightly higher profits in the first three months of the year as people look for value meals during the recession. Profits at the the US fast-food giant, the world's largest hamburger chain, rose 4% to $979.5m (£676m) from $946.1m in the same period last year. The company also said that sales so far in April were strong. Last month, McDonald's warned that the strong dollar and high commodity prices would squeeze first quarter revenues.
sentence2: McDonald's is the world's largest hamburger chain.