It also awards me _____ opportunity to learn American culture at _____ first hand.

A．/; the

B．the; a

C．an; /

D．/; a

外阴癌术后照射腹股沟区，哪项是正确的()

A.可单用电子线照射

B.可单用8MVX放射线照射

C.照射野不一定平行于腹股沟韧带

D.可用X线和电子线混合照射

E.前后野应同时照射