His report was so exciting that it was      interrupted by applause(鼓掌).

A．constantly

B．constant

C．seldom

D．never

我国进入社会主义初级阶段的标志是[ ]

A、新中国成立              

B、三大改造的基本完成  

C、第一部宪法颁布          

D、第一个五年计划完成