One night in October of 2005, farmer Liu ate a carp caught from a pond, and soon suddenly became dizzy and swollen, with unbearable abdominal pain, spasms of hands and feet, vomiting, high fever, and died in a while. After detailed testing by the health department, it was found that Liu's death was related to eating carp. The water quality tests performed by environmentalists on the ponds found that the local farmers had been washing the pesticides in the ponds for many years, so that the fish's body was slowly saved enough. The deadly poison. This passage explains:. ['Carps in the pond are inedible.', 'Carp has strong anti-drug ability.', 'Vigorous dissemination of pesticide safety knowledge to farmers.', 'Liu died of poisoning by eating too much.']