Scientists want to postpone the day when______. A: all insects will be eliminated B: all insecticides will be abandoned C: super-bugs resistant to all poisons come out D: scientists must invent new insecticides

The purpose of washing, cleaning and trimming is to remove dirt, sand, insects, insecticides and other chemicals from the skin or leaves of vegetables and fruit.

Parathion has which one of the following characteristics? ( ) A: It<br/>is inactivated by conversion to paraoxon B: It<br/>is less toxic to humans than malathion C: It is more persistent in the environment than DDT (dichlorodiphenyltrichloroethane, halogenated hydrocarbon insecticides) D: It<br/>is poorly absorbed through skin and lungs E: If<br/>treated early, its toxicity may be partly reversed by pralidoxime