***于1935年10月著诗《七律·长征》：“红军不怕远征难，……三军过后尽开颜”。红军长征胜利的意义是（    ）

下列变化过程中只发生物理变化的是（）

    Christina is an American girl. She is a good student. Every morning she gets up at 6:00. She has her breakfast at home. Then she wears her uniform and goes to school. She studies hard every day. She eats in the dining room when she is in school. After school, she does her homework first, then she cleans the room and helps her mother with the dinner. Before she goes to bed, she usually reads some books. Then at 10:00 p. m. she goes to bed. She thinks she is happy every day. What do you think of her?