He             the idea of flying to Beijing because it was too expensive.[ ]

A．gave away

B．gave out

C．gave in

D．gave up

联用治疗细菌性心内膜炎

A．链霉素与异烟肼
B．链霉素与磺胺嘧啶
C．青霉素与链霉素
D．青霉素与磺胺嘧啶
E．氯霉素与丙种球蛋白