—Is it that Jack often plays computer games    makes his parents worry about him ?

—Yes , I think so .               

A．what

B．when

C．that

D．which

间质性肺水肿的X线征象有（）.

A.双侧上肺静脉扩张

B.蝶翼征

C.双侧胸腔积液

D.病变动态变化较快

E.间隔线阴影