23. Fanner's program has been criticized by the public because .
(A) it causes damage to Net browsers
(B) it can break into Internet sites
(C) it can be used to cause disorder on all sites
(D) it can be used by people with evil intent

21. By saying “... owners of well over half of all World Wide Web sites have set up home without fitting locks to their doors" (Lines 3-4, Para. 2), the author means that _____. (A) those happy times appear still to be with us (B) there simply wasn't any crime to worry about (C) many sites are not well-protected (D) hackers try out tricks on an Internet site without actually breaking in

22. SATAN, a program designed by Dan Fanner can be used ____________. (A) to investigate the security of Internet sites (B) to improve the security of the Internet system (C) to prevent hackers from breaking into websites (D) to download useful programs and information

24. The author's attitude toward SATAN is _____. (A) enthusiastic (C) positive (B) critical (D) indifferent

25. The author suggests in the last paragraph that . (A) we should make full use of the Internet before security measures are strengthened (B) we should alert the most influential businessmen to the importance of security (C) influential businessmen should give priority to the improvement of Net security (D) net inhabitants should not let security measures affect their joy of surfing the Internet

26. The author believes that a successful teacher should be able to _____. (A) make dramatization an important aspect of students’ learning (B) make inspired play an integral part of the learning process (C) improve students' learning performance (D) make study just as easy as play

27. The majority of university professors prefer the traditional way of lecturing in the belief that _________________. (A) it draws the close attention of the students (B) it conforms in a way to the design of the Creator (C) it presents course content in a scientific and objective manner (D) it helps students to comprehend abstract theories more easily

28. What the author recommends in this passage is that _________. (A) college education should be improved through radical measures (B) more freedom of choice should be given to students in their studies (C) traditional college lectures should be replaced by dramatized performances (D) interaction should be encouraged in the process of teaching

29. By saying "They seemed 'a priesthood, rather uneven in their merits but uniform in their bearing...'" (Lines 3-4, Para. 4), the author means that _____. (A) professors are a group of professionals that differ in their academic ability but behave in the same way (B) professors are like priests wearing the same kind of black gown but having different roles to play (C) there is no fundamental difference between professors and priests though they differ in their merits (D) professors at the University of Pennsylvania used to wear black suits which made them look like priests