如图，在三棱柱ABC﹣A₁B₁C₁中，H是正方形AA₁B₁B的中心，AA₁=2$\sqrt{2}$，C₁H⊥平面AA₁B₁B，且C₁H=$\sqrt{5}$．

（Ⅰ）求异面直线AC与A₁B₁所成角的余弦值；

（Ⅱ）设N为棱B₁C₁的中点，点M在平面AA₁B₁B内，且MN⊥平面A₁B₁C₁，求线段BM的长．

建设“丝绸之路经济带”和“21世纪海上丝绸之路”，已成为时代热点。阅读下列材料，回答相关问题。

材料一：汉代丝绸之路图

材料二：唐朝对外交往比较活跃，与亚洲以至非洲、欧洲的一些国家都有往来。……唐朝在世界上享有很高的声望，各国称中国人为“唐人”。

——摘自《中国历史》六年级下册(鲁教版)

材料三：“明初，社会安定，国力雄厚。1405—1433年，明政府先后七次派郑和下西洋。”

——北师大版初中历史教材

材料四：公元1500年前后的地理大发现，拉开了不同国家相互对话和相互竞争的历史大幕，由此，大国崛起的道路有了全球坐标——正是从那个时候起，割裂的世界开始连接在一起。

——《大国崛起》

材料五：中国提出并推动“一带一路”建设，就是要弘扬古丝绸之路和平友好、开放包容的精神，探索新形势下国际经济合作与发展的新模式。特别是推动实现互联互通，为沿线国家加强经贸往来创造物质基础和便利条件，在平等、包容、合作、共赢的基础上续写共同发展的新篇章，最终形成互利共赢的利益共同体和共同发展繁荣的命运共同体。

——人民日报热点辨析

下列句子中运用的修辞手法判断有误的一项是(    )

阅读理解
    I had a summer camp with my classmates last year. Early in the morning. We gathered at the bus station. After saying goodbye to our parents，we got on the buses. It took us more than two hours to arrive at the campground. We got off the buses cheerfully. Laughing and shouting. We jumped and ran all over the place. It was the first time for us to be away from the parents .Some of us started to feel homesick(想家). However, when the night party and dances began, the homesickness was gone. The next day, everybody rushed to the boating class, hoping to be at the head of the others. At first ，my friends and I worked hard, but the boat wouldn't listen to us and kept going round and round. Then the teacher taught us how to work together. After many tries, we did much better. Swimming class was my favorite. It was about the hottest time of a day and the best time to stay in the cool water. The swimming teacher was a funny man, and during the class he often made us laugh happily. During the week I learned a lot of new things and made many new friends. I also learned how to take care of myself.