3. C. 本文最后一句暗示，现在人们还未找到消除计算机病毒的好办法。

2. C. 由 “just to show their intelligence” 推知。

1. B. 感染病毒的计算机速度减慢。

20. A. found B. bought C. paid D. heard

　　 难句注释

　　 ① The price didn?t matter, since business had been good for him that year.

　　 因为那年他生意做得很好，所以价格对他来说不成问题。

　　 ② Then the man suggested that the salesman advertise in the newspaper to offer S｜25,000 for such a pearl.

　　 然后那个人建议珠宝商在报纸上登一则广告，说提供25000 美元买这样的一颗珍珠。

　　 Passage A

　　 从一九八三年计算机病毒首次被确认以来，至今全世界已发现近数万种病毒。本文介绍了一种被称为Jerusalem Viruses的计算机病毒的产生背景、发作时间及其后果。

19. A. old lady?s office B. rich man?s hotel

　　 C. his neighbor?s house D. television station

18. A. price B. money C. pound D. interest

17. A. dear B. poor C. old D. own

16. A. deal B. go C. part D. talk

15. A. from B. of C. off D. with

14. A. room B. house C. office D. shop