I want to buy a hat, but there are so many kinds that I can’t decide         to take.

A．which

B．when

C．how

D．where

腹壁吸刮去脂术可能发生的严重并发症为

A．感染

B．脂肪栓塞

C．血肿和血淤肿

D．皮下淤血

E．水肿