Living in        ever increasingly fast-paced world, we must take____  advantage of every opportunity to develop．

A．an; the

B．an; an

C．the; an

D．the;／

关于腺源性感染下列正确的是

A．发生在唾液腺的感染

B．发生在淋巴结的感染

C．由于大量失血机体抵抗力下降而造成的感染

D．口腔颌面部间隙化脓感染扩散引起唾液腺的感染

E．面颈部淋巴结感染扩散而引起口腔颌面部间隙的感染