Big Ben is not the name of a man. It's the name of a big clock in London. This clock has four faces. So, no matter(无论)where you stand, you can read the time on the face of Big Ben. Each face is the size of a bus. The hands are about four metres long. If you go to London, you may want to visit the Houses of Parliament(英国国会大厦). In that place you will find Big Ben sits at the top of the clock tower in the Houses of Parliament. You will probably hear it and see it. The big clock makes such a loud noise. It goes every quarter of an hour. Big Ben has been the most famous symbol(标志)of  London

十八大对科学发展观做出了新的阐释，科学发展观是（   ）
①是我党与时俱进的科学理论                   ②是立足社会主义初级阶段的基本国情，对我国发展实践的总结
③其核心是发展，第一要义是以人为本   ④是建设中国特色社会主义必须坚持和贯彻的重大战略思想

20世纪80年代，中国农村有副对联：“三十年前分田地，耕者有其田；三十年后又分地，耕者有其责”。其中“三十年后又分地，耕者有其责”指的是（    ）