On February 25, 2013, Li An, a Chinese director, won the best director again. It is his

         time to win an “Oscar”.

A．first

B．three

C．twice

D．second

DTH皮肤试验阳性与下列物质有关（）.

A.抗体、补体和CK

B.抗原、抗原致敏的T淋巴细胞和巨噬细胞

C.抗原抗体复合物、补体和中性粒细胞

D.IgG抗体、抗原和肥大细胞

E.抗原、巨噬细胞和补体