— He plans to give a speech to raise food and clothes for the disabled next month.

— That’s great. I also want to help those children_________.

严重阻碍农村经济和中国社会发展的是（    ）

    My friend Tony is an American 1. He is ten years old. He lives2 his family in China now. There are 3  people in his family; his mother Mrs. Green, his father Mr. Green and his little sister Amy. He has a white cat. 4 name is Betty. Look！Amy is playing 5Betty. His father, Mr. Green, is watc­hing TV. His mother is doing housework. What about Tony? He is doing 6 Chinese homework. He can't 7Chinese well, but he likes Chinese very much. Tony's 8 works in a TV station. His father works in a school as an 9 teacher. Tony and his sister 10 to the same school.

将体积相等的实心铁球和铝球分别放入已调平的天平两托盘上(没有超过天平的称量)，则（    ）