NEW YORK (AP) — U.S. stocks fell on Tuesday, bonds rallied and the price of oil continued to fall.Investors had some downbeat news on the economy to digest, as reports showed that growth in the service industry slowed last month and that factory orders fell in November.KEEPING SCORE: The Standard & Poor's 500 index was down 21 points, or 1.1 percent, to 1,998, as of 1:14 p.m.