Jumping out of_______________airplane at ten thousand feet is quite _______________ exciting experience.

A．/; the

B．/; an

C．an; an

D．the; the

治疗急性心肌梗死的首要目标是（）

A.控制血压

B.缓解疼痛

C.尽快再灌注治疗，开通梗死相关血管

D.抗心力衰竭治疗

E.抗心律失常治疗