Mother: I sent my little boy for two pounds of plums and you gave him a pound and a half. Shopkeeper: My scales are all right, madam. Have you weighed your little boy?想一想为什么店主让妈妈称一下她儿子的重量? Mother: I sent my little boy for two pounds of plums and you gave him a apound and a half. Shopkeeper: My scales are all right, madam. Have you weighed your little boy? Think about why the owner asked her mother to call her son. the weight of?