本部分包括21个小题．每小题6分，共126分．每小题只有一个选项符合题意．

1．甲型H1N1流感病毒侵入人体后，对其免疫过程叙述正确的是

A．人体主要由吞噬细胞特异性吞噬并消灭该病毒

B．需要体液免疫和细胞免疫共同作用才能彻底清除

C．效应B细胞分泌淋巴因子与该病毒结合形成沉淀

D．患者痊愈后若再次感染该病毒，相应的记忆细胞会迅速产生抗体消灭病毒

50. - May I remind you that a Mr Li is waiting outside, sir?　　

­-Oh, that is right, I ____ about it.

A. forget　　　　　　　 B. had forgotten　　　 C forgot　　　　　　 D. have forgotten

49. -My nephew will come tomorrow.

　 - But I’d rather he _____ the day after tomorrow.　　　　　　　　　　　

A. came　　　　　　　　　　　 B. is coming　　　　　　　　 C. will come　　　　　 D. had come

48.-What happened?

-Well, the wind _____ the door open. I' ve already closed it.

　 　 A.is blowing 　　　　　　 B.has blown　　 　　　 C.blew　　　 　　　　　 D.had blown

47.I became a teacher in 1993. I _______ for 13 years by next summer.

　 A. has taught　　　 　　 　　　 B. will teach　　 C. has been teaching　　　 D. will have been teaching

46.-Have you finished your composition already, Jack?

-Yes, I ____ it within half an hour.

　 　 A.have finished　 　　 B.finished　　 　　　　　 C.finish　 　　　　　　　　 D.had finished

45.No conclusion _______ about whether to tear down the old buildings for a theme park until several discussions have been made．

　 A.will be reached　　　　B.is reached　　　 C.is being reached　　　D.had been reached

44.In recent years many football clubs ______ as business to make a profit.

　 A. have run　　　　　　 B. have been run　　　 C. had been run　　　 D. will run

43.Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again H1N1, so we only had time for a few words.

　A. just left　　　　　 　B. has just left　　 　　　 C. is just leaving　 　　D. was just leaving

42.-We　　 to put off our school sports meet until next month.

　-I　　 that.

A. have decided; didn’t expect　　　　　　　　 B. decided; didn’t expect

C. have decided; haven’t expected　　　　　　　 D. decide; don’t expect