题目

Little Robby，our neighbour's nephew，carefully drew some of his water into a bowl and started for the door.How I hated this water rationing (定量供应)．We were forced to bathe without soap in the deep little pond we shared with Jessie，our cow.She was all we have now.Wells were dry，and crops transformed to dust. I held the screen open for Robby and watched，smiling，as he slowly sat on the steps to my house.Dozens of bees circled his hair，and he imitated(模仿)their buzzing.His aunt's words echoed in my ears： “I don't know what I was thinking when I took him in.Doc250×320的简便算法是(　 　)。A. 250×300×20B. 250×4×80C. 25×8×40