My name is Kitty. I have a very big and nice room and I have a great school things collection. My brother’s room is near my room. He is Mike. And he has a small sports collection. I have twenty erasers, ten pencils, nine rulers and eight pens in my schoolbag. My brother has two baseballs, four soccer balls and five basketballs under his bed.

下列病句修改不正确的一项是（    ）

世界上最早使用核武器的国家（　　）