We were all very much attracted by the beautiful scenery________we set foot in the village.[ ]

A．quickly  

B．suddenly

C．finally  

D．immediately

双相Ⅰ型障碍是指（）

A.既有躁狂发作又有重型抑郁发作

B.有轻躁狂发作，无躁狂发作

C.只有重型抑郁发作

D.诊断较为困难

E.急性期可单用抗抑郁药物