传染性单核细胞增多症的病原体是（）
A.单纯疱疹病毒
B.柯萨奇病毒
C.风疹病毒
D.汉坦病毒
E.EB病毒
参考答案：E
解析：传染性单核细胞增多症是一种急性的单核-巨噬细胞系统增生性疾病，病程常具自限性。临床上表现为不规则发热、淋巴结肿大、咽痛、周围血液单核细胞显著增多，并出现异常淋巴细胞、嗜异性凝集试验阳性，血清中可测得抗EB病毒的抗体等。EB病毒为本病的病原，电镜下EB病毒的形态结构与疱疹病毒组的其他病毒相似，但抗原性不同，EB病毒为DNA病毒。
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| People often say that the Englishman's home is his castle. They mean that the home is very important and 1 . Most people in Britain live in houses 2 flats, and many people own their homes. This means that they can make them individual; they can 3 them and change them in any way they 4 . In a crowded city the individual knows that he or she has a private space which is 5 for himself of herself and for 6 friends. People usually like to 7 their space. Are you sitting now in your home or in a library or on a beach or a train? If you are on the beach you may have spread your 8 around you; on the train you may have 9 your coat or small bag on the seat beside you; in a library you may have one 10 or chair which is your own. Once I was traveling on a 11 to London. I was in a section for four people and there was a table between us. The man on the 12 side to me had his briefcase on the table. There was no 13 on my side of the table at all. I was made rather 14 , I thought he thought that he owned the 15 table. I took various papers out of my bag and put them on 16 ! When I did this he stiffened and his eyes nearly popped out of his head. I had 17 his space! A few minutes later I t  ook my papers 18 his case in order to read them. He immediately 19 his case to his side of the table. (Of course , it is 20 that he just wanted to be helped to me! ) | |||
| ( )1. A. helpful ( )2. A. rather than ( )3. A. buy ( )4. A. make ( )5. A. only ( )6. A. unwanted ( )7. A. mark ( )8. A. towels ( )9. A. find ( )10. A. book ( )11. A. plane ( )12. A. opposite ( )13. A. matter ( )14. A. angry ( )15. A. right ( )16. A. the table ( )17. A. invaded ( )18. A. into ( )19. A. hid ( )20. A. possible | B. personal B. as well as B. leave B. clear B. already B. close B. decide B. sands B. give B. corner B. train B. back B. weight B. hurt B. only B. his case B. shut B. for B. set B. true | C. necessary C. as a result of C. paint C. like C. ever C. sick C. choose C. papers C. put C. companion C. way C. wrong C. light C. fearful C. small C. the seat C. separated C. off C. moved C. wonderful | D. useful D. or rather D. offer D. prepare D. even D. invited D. keep D. flags D. store D. meal D. street D. good D. space D. busy D. whole D. his side D. shared D. out of D. kept D. ordinary |