TORONTO (Reuters) - Canada's main stock index dropped to its lowest in four weeks on Wednesday after the World Bank cut its global growth forecasts, but BlackBerry jumped after a report said it had been approached by Samsung Electronics Co about a takeover. The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 102.73 points, or 0.72 percent, at 14,084.43. Seven of the 10 main sectors on the index were in the red. (Reporting by John Tilak; Editing by Peter Galloway)



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