题目

Tom had retired（退休）and lived by himself a long way from town. He seldom left his home, but one day he went into town to buy some things in the market, and after he had bought them, he went into a restaurant and sat down at a table by himself. When he looked around, he saw several old people put eyeglasses on before reading their newspapers, so after lunch he decided to go to a store to buy himself some glasses too. He walked along the road, and soon found a store.     The man in the store made him try on a lot of glasses, but Tom always said,“No, I can’t read with these.”   19、已知三角形的3条中位线分别为3cm、4cm、6cm，则这个三角形的周长是26cm．