从专制到民主、人治到法治是人类历史的重大进步，经历了漫长的奋斗历程。请回答：
(1)1787年，制宪会议制定了美国宪法，该宪法规定美国是什么体制的国家？根据宪法，谁被选为美国第一任总统？
(2)辛亥革命极大地推进了中国民主政治的进程，请用相关史实予以说明。
(3)1954年《中华人民共和国宪法》颁布，它是我国第一部社会主义性质的国家根本大法，该宪法是在哪次会议上通过的？怎样理解其社会主义性质？

小建今年3月去湖南省植物园春游回来赋诗一首：“植物园里好风光，处处都闻樱花香，此花只应东瀛有？人生何处不潇湘！”此诗中关于“处处闻花香”的解释正确的是（    ）                                                         

如图甲所示，在匀强磁场中，一矩形金属线圈两次分别以不同的转速，绕与磁感线垂直的轴匀速转动，产生的交变电动势图象如图乙中曲线a、b所示，则（   ）

    Soap operas from South Korea have been popular in China for more than twenty years now. So it is not the first time for the soap operas made in China to feel less popular. But this time, they are facing more difficulties, for The Heirs(继承者们)and My Love From the Star really made a full success.

    A senior official said he sometimes watched soap operas from South Korea, as well as House of Cards, an American opera about politics（政治）. These operas made both in South Korea and in America have a lot of lovers in China.

Many people agree that China's soap operas can't be much loved by most Chinese, because they are not as interesting and exciting as those operas from South Korea and America, such as My Love From the Star, a South Korean love story between a time-traveling professor and a famous movie star.

    However, South Korea not only provides soap operas but also some variety shows(综艺节目). Where Are We Going, Dad? is not an original Chinese show. We learned it from South Korea although not many in China know about that fact.

    South Korea has created many popular shows and these stories tell there's no difference between men and women but in their country men are certain to play a more important role.