China is developing a rural health care service system, ____ I’m sure more residents will benefit.

A．from which

B．of which

C．about that

D．from that

右图展示的是火箭发射时的壮观情最．火箭发射升空时，燃料通过燃烧将 ▲ 能转化为燃气的内能，燃气对火箭做功，又将内能转化为火箭的 ▲ 能．