温家宝总理在农民工返乡就业情况专题调研时说：“冬天总会过去，春天总会来的，太阳也总要出来的。我相信，渡过这个难关，我们一定会生话得更好。这是因为
①事物的运动变化是有规律的      ②事物的发展是前进性和曲折性的统一
③量变必然会引起质变            ④矛盾双方在一定条件下能够相互转化

如图,将一个长为10cm,宽为8cm的矩形纸片横向对折,再纵向对折后,沿所得矩形两邻边中点的连线(虚线)剪下,再打开,得到的图形的面积为(     )

下列细胞结构中，能发生碱基互补配对行为的一组是（   ）
①细胞核 ②中心体 ③叶绿体 ④线粒体 ⑤高尔基体 ⑥内质网 ⑦核糖体

从新中国成立到20世纪80年代中期，我国国内人口迁移的特点是（  ）

阅读理解
    China Youth says that more and more girl students have entered colleges to study in recent few years. As we know, once the number of boys was larger than that of girls, and the boys did much better than girls in our country for a long time. Now things have changed a lot.
In recent years, the proportion of girl students is growing fast. In 1998, about 39.7% of college students were girls. In 2000, it was 41.07% and in 2001, the number was 42.14%.
    There are several reasons for this.
    Firstly, there is little difference between boys and girls in their intelligence(智力). That’s to say, girls are as clever as boys. And boys have more interests than girls, so they may not do well in their study.
    Secondly, girls are more careful and more sensible than boys. They work harder at school and they do better in all exams.
    Another reason is that with the development of society, people pay more and more attention to girls' education.