Some Mengniu milk was found to contain _____ matter linked to liver cancer, country's top quality

management unit said.[ ]

A. the; /    

B. the; the        

C. a; a                

D. a; the

SE序列动脉导管未闭表现为（）

A.主动脉和肺动脉之间管状或漏斗状的低信号影

B.主动脉和肺动脉之间管状或漏斗状的中等高信号影

C.主动脉和肺动脉之间管状或漏斗状的高信号影

D.主动脉和肺动脉之间管状或漏斗状的低信号为主的混杂信号影

E.主动脉和肺动脉之间管状或漏斗状的高信号为主的混杂信号影