根据短文内容，选择最佳答案。

    I come from Holland (荷兰). In our country, there are plenty of windmills. There are more than 2,000 windmills in Holland. These windmills make electricity (电) for the country. It is a small country in Europe. About 20% of its land comes from the sea. The population of Holland is only 16,000,000. The weather is very nice, so the flowers can grow very well. Maybe you like roses, kapoks or lilies. However, the tulip is a symbol (标志) of the country. People celebrate Tulip Festival every year. There are a lot of cows in this country. You can enjoy good milk and cheese here. You can go everywhere by train, taxi, underground or ship. They are fast and convenient. People here also love to ride bikes. Riding a bike is free and relaxing. What do children do when they pass their exam? They often hang a schoolbag and a national flag at the gate! Come and have a good time in Holland!

材料一：食贱则农贫，钱重则商富；末事不禁，则技巧之人利，而游食者众之谓也。故农之用力最苦，而赢利少，不如商贾、技巧之人……食贵则田者利，田者利则事者众；食责，籴（即买米）食不利，而又加重征，而民不得无（不）取其商贾技巧而事地利也。

——《商君书》

材料二：时民困饥流散，豪右多有占夺，（李）安世乃上疏……高祖深纳之，后均田之制起于此矣。九年（公元485年），下诏均给天下民田：“诸男夫十五以上，受露田四十亩，妇人二十亩，奴婢依良。丁牛一头受田三十亩，限四牛。所授之田率倍之，三易之田再倍之，以供耕作及还受之盈缩……”于是海内安之。

——《魏书》

材料三：对北魏孝文帝改革的评价，学术界有不同的声音。清代史学家赵翼在《廿二史札记》中认为北魏政权的衰落和灭亡缘于“汉化”政策；而当代著名史学家黄仁宇却认为：孝文帝改革“不期然的做了中国再统一的工具”。

请回答：

自由落体运动的v﹣t图象应是（   ）

选择适当的关联词。

星期天你_____去公园，_____去奶奶家。（    ）