BEIJING (Reuters) - China's economy grew at its slowest in nearly three years in the first three months of 2012, with a weaker than expected reading raising investor concerns that a five-quarter long slide has not bottomed and that more policy action would be needed to halt it. The annual rate of GDP growth in the first quarter slowed to 8.1 percent from 8.9 percent in the previous three months, the National Bureau of Statistics said on Friday, below the 8.3 percent consensus forecast of economists polled by Reuters. ...{br}{br}View the Entire Article{br}