常用于描述期前收缩心电图特点的术语有（）

A.多源性期前收缩

B.代偿间歇

C.联律间期

D.单源性期前收缩

E.频发性期前收缩

I would like to buy a house—modern，comfortable，and _______ in a quiet place．

A．first of all

B．after all

C．above all

D．in all