—Have you seen the TV play My Ugly Mother?

—Yes, it’s well worth         . It’s         moving that I’ve seen it twice.

A．seeing; too

B．to see; enough

C．seeing; so

D．to see; such

退变性脊椎滑脱症需与椎弓根性脊椎滑脱症鉴别，后者的特点是（）

A.滑脱程度常较重

B.常伴有椎间盘突出

C.椎弓根峡部的单侧或双侧断裂

D.椎管前后径常有明显增宽

E.椎管前缘与棘突后缘间距增大