The colors of the Five-Circled rings of Olympic Game (奥林匹克五环旗) are _____? [ ]

A. blue, black, green red and yellow

B. white, yellow, green, blue, black.

C. green, red, pink, black, blue. 　　

D. brown, green, black, red, white.

团注动态增强扫描与常规增强扫描相比，下列哪一项不是动态增强扫描的优点：（）.

A．提高小病灶的检出率 

B．提高对病灶性质的鉴别能力 

C．显示肝内血管解剖较好 

D．显示血管受侵和癌栓较好 

E．显示肝实质强化程度较好