题目

选择正确的答案Ben is going to visit his grandparents in New York next week. He wants to give some presents to them. Yesterday he went shopping with his parents. In the shop, he bought a blue sweater and black trousers for his grandfather and some good books for his grandmother. Both his parents thought they were very good presents. Ben was very happy.【1】Where are Ben’s grandparents? ( )A. In London B. In New York. C. In Nanjing.【2】What did Ben do yesterday? ( )A. He visited his grandparents.B. He went shopping with his friends.C. He went shopping with his parents.【3】How ma先化简，再求值：，其中x=-2．