阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    Li Daiyu and her cousin Liu Qian were on a trip to Canada to visit their cousins on the Atlantic coast. Rather than take the plane all the way, they ____（plan）to fly to Vancouver and then take the train from west to east across Canada. The thought that they could cross the whole continent was ____(excite).

    Canada is the second biggest country in the world. People say Vancouver is Canada's most beautiful city ____(surround)by mountains and the Pacific Ocean. On the coast north of Vancouver, it is so wet there that the trees are extremely tall.

    That afternoon aboard the train, the cousins settled down in their ____(seat). Their next stop was Calgary,____ is famous for the Calgary Stampede. They know that cowboys come from all over the world ____(compete)in the Stampede. Many cowboys have a gift ____ riding wild horses. They also learned that most Canadians live within a few hundred kilometers of the USA border and that Canada's population is only ____(slight)over thirty million, but now they ____(amaze)to see such an empty country. Then they arrived in ____urban area, the busy port city of Thunder Bay at the top of the Great Lakes.

背景材料：2014年10月20日至23日，***第十八届中央委员会第四次全体会议在北京举行，这是中国改革开放以来中共第一次以依法治国为主题的中央全会。会议决定将每年12月4日定为“国家宪法日”，在全社会普遍开展宪法教育，弘扬宪法精神。
根据以上材料，结合下图回答下列问题：

一个钝角与一个锐角的差是　　　　　　（　　）

近代社会的民主思想与实践，下列材料是康有为在不同时期的思想，据此回答问题。

材料一  （1898年）“人不能有常而无变，……《春秋》发明改制，《易》取其变易，天人之道备矣。”“今天下之言变者，曰铁路、曰矿务、曰学堂、曰商务，非不然也，然若是者，变事而已，非变法也。……日本改定国宪，变法之全体也。”“人君与千百万之国民，合为一体，国安得不强”，“三权者，有议政之官，有行政之官，有司法之官也。”

材料二  （1902年）（中国）“与美迥异不同”，革命必至“内乱相残”，“令外人得利”。（1912年8月）“今既合五族而大一统，存帝号而行共和……今际破坏，虽吾党所不预，而他时建设，岂吾党所能辞？”“讲乎外势而先弭内乱，以国为重而民从之，……保中国已有之粹，而增其未备。”（1913年6月）“名为共和，实则共乱”，“仅令千数百之暴民得民权平等自由，是排除一人之专制而增设千数百人之专制”，“追思戊戌时，鄙人创议立宪，实鄙人不察国情之巨缪也。”

——摘编自康有为《日本变政考》等