________they visited the Science Museum，they showed great interest in everything they saw.

A．The first time

B．For the first time

C．At first

D．At the first time

什么活动导致辛亥革命的总爆发？（）

A.钦廉防城起义

B.黄花岗起义

C.保路运动

D.清末民初思潮交锋