动脉导管未闭超声心动图特点（）。

A.左房、左室增大

B.心底短轴切面可见降主动脉与肺动脉之间有导管相通

C.肺动脉增宽

D.CDFI可探及红色为主五彩镶嵌血流通过

E.多普勒频谱为双期连续性湍流频谱

In his novels of social satire, ______ made realistic studies of the aspirations and frustrations of the "Little Man. "

A. Arnold Bennett



B. H. G. Wells
C. John Galsworthy



D. George Bernard Shaw