中央集权封建君主制度对中国政治形成了长期的影响。下列史实描述正确的有( )
①秦始皇确立了中央集权官僚制度
②汉武帝通过颁布推恩令等措施加强中央集权
③唐朝建立三省六部制完善中央集权制
④辛亥革命推翻了中国两千多年的封建君主专制制度
A:①②④
B:①②③
C:①③
D:③④
抛物线y=x2+1的最小值是____ .
A. She's my mother.
B. I have a happy family.
C. What's this?
D. This is my father.
Rose: ____
Tom: It's a picture (照片) of my family.
Rose: Who's this?
Tom: ____
Rose: Who's she?
Tom: ____ And this is me.
Rose: Are you happy?
Tom: Yes. ____