I have a good friend. His name is Nick. He is a middle school student.  He usually 1 at 5:30 every day. Then he has 2 quick breakfast and 3 to school at six. He usually goes to school by bus. First he 4 to the bus stop. Then the bus takes 5 to school. It usually takes him forty minutes6 to school.

    My home is about two miles from school. I usually leave for school at about 6: 30. I usually get to school 7 It takes me about twenty 8 But sometimes I got there by bike.  It takes me only ten minutes.

    There are different 9 to get to school. But I like10 best.

①中央集权制度的建立

②造纸术的发明

③文字和度量衡的统一

④张骞出使西域

（Ⅰ）求证：A，B，C三点共线；

（Ⅱ）已知A（1，cosx），B（1+sinx，cosx），x∈0， $\frac{\pi }{2}$ ，f（x）= $\overrightarrow{OA}$ • $\overrightarrow{OC}$ ﹣（2m²+ $\frac{2}{3}$ ）•| $\overrightarrow{AB}$ |的最小值为 $\frac{1}{2}$ ，求实数m的值．

阅读图文材料，完成下列要求。

某科考队8月考察堪察加半岛，考察中发现，勘察加半岛北部发育苔原，南部生长森林；东西向气候区域差异显著；大型植食性和肉食性野生动物数量较少，但冬眠杂食性且善捕鱼的熊的数量较多；大量来自海洋的鲑鱼溯河流而上，成为熊的重要食物。图6示意勘察加半岛的地形。