-- Where’s the video tape?

--         .

如图，在Rt△ABC中，D，E为斜边AB上的两个点，且BD=BC，AE=AC，则∠DCE的大小为____（度）．

阅读理解

B

       Do you remember when your grandma told you the story of Snow White? Ah, the happy days of childhood!

       But did you know that Snow White comes from Germany? It's just one story from the 209 in Grimm's Fairy Tales (格林童话). The Grimm brothers started to collect fairy tales in 1806. Their first book came out in 1812.

       Why are German fairy tales so interesting? Maybe it's because they come from a great place famous for its stories – the Black Forest.

       The Black Forest is in the southwest of Germany. It's a very large and beautiful forest of the country. It's famous for its trees and lovely views (风景). There are valleys (峡谷) and waterfalls there. It's a good place to start a story.

       Don't forget to bring something back if you visit. People there are good at making clocks, musical instruments (乐器) and watches.

（2015•柳州）2014年12月，我国一项调水工程正式通水，北京市民喝上了来自丹江口水库的水，读该工程示意图（如图），回答问题．
 
该工程的水源地与主要受益地分别位于（ ）

哈佛大学肯尼迪政府学院院长约瑟夫·奈曾提出“软实力”一说，即“不是由于强制与报酬，而是由于魅力而获得所希望的结果的能力。软实力从国家文化、政治理想和政策魅力中产生”。其实，我国在外交上并不缺乏软实力，中国就是软实力运用得比较好的国家之一。下列做法能够体现这一观点的是
①我国在处理对外关系时坚持“和为贵”，贯彻和平共处五项原则
②进入新世纪，中国提出了“和谐世界”的主张
③随着中国公民在海外遭受的安全威胁渐多，我们必须“带剑经商”
④在处理和周边国家在南海问题上的争议时,中国提出了“搁置争议、共同开发”的原则