The TV series of GongSuo Heart Jade became popular and the song “ Love the feed” sung by Yangmi was a ____ at once and loved by young people. 

A．shock

B．strike

C．hit

D．beat

（）关于歌尼斯堡七桥问题和关于多面体顶点、边和面关系的讨论，是几何学发展的重要突破，此时关心的不再是度量问题，而是位置问题、连接问题。

A.欧几里得

B.欧拉

C.海亚姆

D.高斯