听力题 Indian police have found a large cache of plastic explosives in Bombay, the type used in last month''s serial bombings that killed more than three hundred people. Police say they seized nearly two thousand kilograms of explosives from a marshy region north of Bombay. About thirteen hundred kilograms of similar explosives were discovered in the area last week. Police also arrested fourteen more people in connection with the bombings.The Indian police were reported to have discovered_________.