题目

Mr Baker worked in a small town . Two weeks ago his friends helped him to find work in New York. So he and his wife were going to move to a building in the big city. Mr. Baker wanted to live in a room on the first floor and he could go for a walk by the beautiful garden after supper. But his wife hoped to live on the second floor . There is enough sunlight(阳光), I think . And we can watch the flowers in the garden by the windows , said the woman .Mr Baker thought she was right and agreed with her . It was Saturday . All their friends came to help them. They were tired but still held某农场,可以全部种植水果、蔬菜、稻米、甘蔗等农作物,且产品全部供应距农场(km)()的中心城市,其产销资料如右表:当距离达到以上时,四种农作物中以全部种植稻米的经济效益最高.(经济效益=市场销售价值-生产成本-运输成本),则的值为A.50 B.60C.100D.120
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