In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
Open Shortest Path First (OSPF) is a (36) routing algorithm that (37) work clone on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (38) processing power. The (39) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (40) at regular intervals.

A．more

B．less

C．same

D．most

急性阑尾炎最严重的并发症是（）

A.阑尾穿孔腹膜炎

B.门静脉炎

C.膈下脓肿

D.盆腔脓肿

E.肠间脓肿