Most schools are going to start a program(课程)called B.Y.O.T. (bring your own technology). This program allows(允许)students to bring iPads, cell phones or other things to school for study. One aim(目标)for this program is that the students don't need to carry textbooks any more. They can download math, science, social studies, and read textbooks on their iPads. Another one is that they can get free educational subjects to play in their free time!

    Schools have set up a free Wi-Fi system(系统)just for the B.Y.O.T. program. Thank teachers for all their hard work to set this program up. I really think this program will go well in most schools and I also think the learning will be better than ever.

    However, maybe some schools will not allow this because they think that it will make kids waste too much time and they might break their iPads.

    This program will let students have fun and learn at the same time. If you like your iPads and you like to read, school is getting started with reading with iPads. Many high schools and middle schools have already started and so have some primary schools. But most primary schools are coming along! Let's tell them: Hurry! Get ready to learn!

材料一：1933年成立的田纳西流域工程管理局，利用美国政府提供的投资，招收大批失业工人，兴建水坝、水电站，发展航运，结果建成了大型的水电站和完整的航运系统，促进了这一地区工业和农业的发展。

──摘自吴于廑、齐世荣主编《世界史》

材料二：下表为1953～1956年底我国加入农业初级合作社情况统计表（结合吴本祥主编《中华人民共和国史》整理）