1996年7月，中国签署了《全面禁止核试验条约》，同时明确表示：“中国发展核武器是在特定的历史条件下迫不得已作出的决定”．新中国成立之后，在核武器研究方面作出杰出贡献，被称为“两弹元勋”的科学家是（　　）

阅读下列短文，从每小题的三个选项中选出最佳选项。

    Hello, I'm Ann. This is my family. There are five people in my family. My grandparents are old. They are teachers. My father is tall. He has a white shirt. He is a fireman. He is not afraid of fire. He can help people. He likes his job. My mother is tall and beautiful. She has long hair. She has a yellow skirt. She is a nurse. I don't have any aunts. What about you?

This is Kitty. _______ thin.