从原始社会到现今，我国水稻种植区域扩大的主要因素是（　）

                                                                                                                           孙权劝学
       初，权谓吕蒙曰：“卿今当涂掌事，不可不学！”蒙辞以军中多务。权  孙权曰：“孤岂欲卿治经为博士邪!但当涉猎，见往事耳。 卿言多务，孰若孤？孤常读书，自以为大有所益。”蒙乃始就学。 
       及鲁肃过寻阳，与蒙论议，大惊曰：“卿今者才略，非复吴下阿蒙！”蒙曰：“士别三日，即更刮目相待，长兄何见事之晚乎！”肃遂拜蒙母，结友而别。
不记人过
       吕蒙正相公，不喜计人过。初参知政事入朝堂，有朝士于帘内指之曰：“是小子亦参政耶！” 蒙正佯为不闻而过之。其同列怒，令诘其官位姓名，蒙正遂止之。罢朝，同列犹不能平，悔不穷问，蒙正曰：“一知其姓名，则终身不能复忘，固不如无知也，不问之何损？” 时人皆服其量。
【注释】①吕蒙正（944-1011）：宋代政治家。②参知政事：官名，副宰相。③朝士：朝中官员。

阅读理解

    It is Sunday today. It is my grandma's birthday. Father, mother and I go to visit her.

    She lives with my uncle. In the morning we buy a birthday cake and some fruits and go to her house at ten o'clock.

    We spend about half an hour getting there. My grandma and uncle are very glad to see us. We give the presents to grandma and say“Happ y birthday to you! ”She is very happy. Then we sit down to talk. My uncle can cook.

    The meal is very nice. We all like it very much. After lunch, I play with my uncle. At four o'clock, we say goodbye and go home.