Karl was at home with his brother Michael and his sister Addy．As he ____(推)the window open, he saw a big panda in the backyard．He ____(大喊)to Michael．Michael ____(回答)that pandas should be in the ____(森林)．Then they went out, the panda was already there talking to Addy．The panda said he was sorry that he flew here with his umbrella ____(没有)____(敲门)on the____(门)．The next day, Addy walked____(往)the panda's house with a gift．In ____(返回), the panda told Addy a story  ____(在……上面)a tree．And the panda also told Karl another story after they played games．That's the story in the book Zen Shorts．

上海市地方协会、国货联合会及国货产销合作协会等三团体，为提倡国货起见，特公定民国二十二年为“国货年”。“国货年”的提出（    ）

火车从车站出发沿平直铁轨行驶，在某段位移的前$\frac{1}{3}$位移的平均速度是$\frac{2}{3}v$；中间的$\frac{1}{3}$位移的平均速度是v；最后$\frac{1}{3}$位移的平均速度是$\frac{2}{3}v$，这列火车在这段位移中的平均速度是（ ）