农业科学（science of farming）
     today i went to the country to see my uncle. seeing the green cabbages and the fine wheat, i couldn't help asking how he could grow them so well.uncle said that science of farming was important. it included: choosing the best seeds; keeping the condition of soil good and ploughing deeply; sowing the seed and growing young plants at the correct time; changing the crops in the fields; and giving plenty of water, light and fertilizer.