2012年我国继续实施积极的财政政策和稳健的货币政策，加大对民生领域和社会事业支持保障力度，增加对“三农”、科技、教育、卫生、文化、社会保障、保障性住房、节能环保、中小企业、居民消费、欠发达地区经济发展等方面的支持力度，推动重点领域改革。

请结合材料说明财政发挥了怎样的作用。

下列函数在其定义域上既是奇函数又是减函数的是（　　）

短文改错：假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的短文。短文中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    On January 5th, students in our school visited Robot World, which we saw a great diversity of robot. I was amazing to find those robots could do a great number of things just like real people, included playing chess, playing the piano and drawing pictures. What's more, the robots were in different kinds and shapes, which made us enjoyable. In addition, that excited me most is the show given by a group of robots. They danced just as if they were dancers on the stage. By visiting Robot World, I have learned a lot of about robots, especial about their functions and shapes. The great human wisdom is so powerful that it make us feel more comfortable live in the world.

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