单选题

　　1.[阅读选择]One reason is economic. In a traditional agricultural economy,large families are helpful. Having more children means having more workers in the fields and someone to take care of the parents in old age. In an industrial economy,the situation is different. Many children do not help a family;instead,they are an expense. Thus,industrialization has generally brought down the birth rate. This was the case in Italy， which was industrialized quite recently and rapidly. In the early part of the twentieth century,Italy was a poor,largely agricultural country with a high birth rate. After World WarⅡ,Italy's economy was rapidly modernized and industrialized. By the end of the century,the birth rate had dropped to 1.3 children per woman,the world's lowest.

　　In a traditional agricultural economy,a large family_______.

　　A.can be an advantage

　　B.may limit income

　　C.isn't necessary

　　D.is expensive