已知|a|=7，|b|=3，a﹣b＞0  求a+b=____．

2010年3月，温家宝总理在政府工作报告中指出：“我们所做的一切都是要让人民生活得更加幸福，更有尊严、社会更加公正和谐。”为了让“社会更加公正、更加和谐”，我们应(  )

被美国称为“中国版《辛德勒名单》”的纪录片《南京》是第一部以外国人的视角回顾南京大屠杀的纪录片，它控诉了哪国侵略者在中国犯下的滔天罪行（    ）

一定质量的NaOH溶液与8gSＯ₃恰好完全反应，得到Na₂SＯ₄溶液1000g，求所得硫酸钠溶液中溶质的质量分数（计算结果精确到0.01%）．（提示：2NaOH+SO₃═Na₂SO₄+H₂O）

阅读文章，选择正确的答案    Bim is a puppet. He is made of wood. He has arms and legs，and hands and feet. He has black hair and green eyes. There are strings(线)on his arms and legs. There are also strings on his hands and feet.

    Children like to play with Bim. They pull his strings. They move his arms and legs，and his hands and feet. They can not move his eyes or his ears. They can not move his nose or his mouth.
    Pip is a puppet, too. But she is made of cloth. She is a glove puppet. She has arms and hands，but she doesn't have legs or feet. She doesn't have any strings.

    Children like to play with Pip, too. They can put their small hands inside Pip. They can put their fingers in her hands and make them move. Children make Bim and Pip talk to each other. They make them tell each other stories