CNBC | Dow off triple digits; biotech tries for gains CNBC U.S. stocks traded mostly lower Tuesday as investors eyed oil prices and softness in China trade data, ahead of the Fed's meeting next week. "I think it was a combination of weaker oil prices and pretty ugly export data from China that sent investors ... Wall St. falls on weak Chinese data, oil slump Wall Street Declines as Oil, Energy Find Firmer Footing Dow briefly plunges 200; energy weighs |