党和国家历来重视农民、农业、农村的发展。在建国初期就多次推动农村变革，其中哪一次是大大解放了农村生产力（    ）

    Jim's grandparents live in a black building．____the building is a bus station．Jim always____off the bus there when he comes to see his grandparents．Between the station and the building is a busy street．____down the street three hundred metres and turn right，there is a big market．Jim's grandparents usually buy fruit，meat and____there.Now they are buying beef there.They like living there____it's easy for them to buy what they need and go out．

如图所示，为某小球做平抛运动时，用数码相机的摄像功能获得的相片的一部分，图中背景方格的边长为5.0cm，（取g=10m/s²）．（若结果含有根号，用根号表示）