Carl is studying _____ food science at college and hopes to open up _____ meat processing factory of his own one day.  

A．/; a

B．/; the

C．the; a

D．the; the

头皮（）

A.腋窝组群

B.颈深上群淋巴结组

C.腹股沟组群

D.耳后及乳突区淋巴结组

E.左锁骨上群淋巴结