一个从静止开始做匀加速直线运动的物体，从开始运动起，连续通过三段位移的时间分别是1s、2s、3s，这三段位移的长度之比和这三段位移上的平均速度之比分别是（  ）

【历史——选修1：历史上重大改革回眸】

材料：民国时期的税收史是税制体系从传统向现代演变的重要时期。可划分为四个时期：一是1912年至1927年的北洋军阀时期。……先后试行划分国家税和地方税、改革盐税、整顿厘金、整理矿税、推行印花税、整合烟酒税等努力，到1925年，逐步建立起以关税、盐税、货物税、田赋为四大税种的税制结构。二是1927年至1937年的南京国民政府时期。在取得关税自主、财政统一的基础上，以关税、盐税为主体的国家税和以田赋、契税为主体的地方税初具雏形，形成了影响深远的统税（货物税系）和所得税（直接税系）的税收架构，为流转税与所得税双主体结构税制发展奠定了基础。三是1937年至1945年的重庆国民政府时期。把地方税系划入中央，形成了融关税、盐税、货物税、直接税、土地税、地方自治税收等相对独立的税收系统。……四是1945年至1949年的南京国民政府时期。开征特种营业税，并从立法的角度将关税、土地税、地方税等整合为一套完整的税制框架。

——摘编自《民国时期税收探析》

    Ari's mother asked him to gather firewood for the fire. Instead of doing the chore right away. Ari thought he could play with his friends, Mitch and Joe, first.

    Not long after, his mother began to wonder1he had not returned. It was already dark and she was worried. At the same time, Ari realized that he had not done as his mother had 2 and told his friends about this. The boys then began gathering the 3 .

    Meanwhile, Ari's mother came cooking for him. She soon4the boys' voices. She had mixed feelings. She was5to know that he was safe but angry at the same time because Ari had disobeyed her. She decided to6the boys a lesson.

    She hid in the nearby bushes (树林). 7she picked up a twig (树枝) and threw it. It hit the ground making a sharp noise. It caught the boys8. They stopped what they were doing and looked at one another. She threw9twig in the opposite direction. The boys jumped. The mother cried in a low trembling voice, “10your mother!” Scared, the boys dropped everything and ran home. Ari's mother could not stop laughing

    After picking up some pieces of firewood, she headed home, where she found Ari in tears.

    “Mother Mother, I'm sorry I didn't listen to you," he sobbed(哭诉) .His mother held him with love. She knew he was truly sorry and would not repeat his mistake.