如图，已知楼AB高36米，从楼顶A处测得旗杆顶C的俯角为60°，又从该楼离地面6米的一窗口E处测得旗杆顶C的仰角为45°，求该旗杆CD的高．（结果保留根号）

阅读下面短文，从各题所给的A、B、C、D四个选项中选出最佳选项。
B
Join Us for a Day at Sun Valley Amus ement Park

    Children aged 10 to 14 are invited to take part in the "Event of the Summer" at
Sun Valley Amusement Park, the most popular amusement park on the East Coast.
Sun Valley has more than 80 amusement rides. For sports lovers, there are
basketball courts, an indoor baseball field and climbing walls.
    No amusement park would be complete without a gift shop. Sun Valley
has two.
    You won't want to miss out on this day of fun. Join us at Sun Valley Amusement Park on July 14. Register (登记) early.
    • The cost of the trip is $ 25. This includes tickets and all rides.
    • We suggest that all children bring lunch.
    • Buses leave at 9.00 AM and return at 5.00 PM.
    • Rain Date: Wednesday, July 16.
    Register at the Children's Recreation Center at the Town Hall by July 3.
    A one-day registration will also be held on July 1 at the Brown School.
    For more information, call Jane Parks at 555-7267.

广东近年来相继给低保户、五保户、优抚对象等低收入者发放“民生红包”。 2010年广东省经济的主要任务之一仍是着力保障和改善民生。这一举措

目前妄图侵占我“钓鱼岛”主权的海上邻国是（  ）

2010年8月1日，北京公安局同步开通官方博客、微博与播客，构成三位一体的网络公共平台，倾听群众呼声，了解社情民意，打造“平安北京”。这一举措旨在
①便于市民对市公安局的监督
②强化市公安局的管理职能
③扩大公民政治参与的权利
④拓宽公民利益新渠道