【简答题】A.Farmers had less money to spend than other Americans. B.Farmers earned about one-third the income of non-farmers. C.Farmers earned almost as much money as the non-farmers. D.Farmers earned more mone...
【简答题】A.Because farmers use less insecticides now. B.Because farmers have been using insecticides for many years. C.Because insects use the mechanisms against plants to fight insecticides. D.Because insects...