— Have you heard of Liu Qian from Taiwan?

— Sure! His magic performance is _____ amazing for people forget. [ ]

A. so; that

B. such; that

C. too; to

根据热水在系统中循环流动动力的不同，热水采暖系统可分为( )。

A．垂直式热水采暖系统

B．水平式热水采暖系统

C．自然循环热水采暖系统

D．机械循环热水采暖系统