Questions 21-25 are based on the following passage：
Oxford and Cambridge differ from the rest of the universities in Great Britain in many important respects， but resemble each other quite closely.
Oxford was founded in the 12th century. There are at present 35 colleges：
three are for women only and the rest take both men and women. There are at present approximately 9，400 students in residence， of whom over a third are women. The city of Oxford is popular with tourists because of the University s many beautiful medieval buildings.
Cambridge was founded in the 13th century. There are at present 28 colleges， of which only one is for men students only and two for women only. The remaining 25 take both men and women. There are at present over 9000 students in residence， of whom a third are women. Cambridge University has made the city of Cambridge an internationally famous tourist entre.
21. With the first sentence， the author wants to say that _____. (A) Oxford and Cambridge are different (B) Universities in Britain are different in many aspects (C) Oxford and Cambridge share many similarities (D) Oxford and Cambridge are different from each other
22. The ratio of male to female students in residence at both universities is about _____. (A) 1：2 (B) 1：3 (C) 3：32 (D) 3：10
23. Which of the following statements is NOT true？ (A) Oxford has a longer history than Cambridge. (B) There are 32 colleges in Oxford that only accept men. (C) There is one college at Cambridge that only accepts men (D) There are more male students than female at both universities
24. Tourists go to the city of Oxford to _____. (A) study there (B) see the medieval buildings (C) view the river (D) look at the residents
25. The passage is mainly about the _____. (A) history of two famous universities in Britain (B) comparison between Oxford and Cambridge (C) number of students at Oxford and Cambridge (D) introduction of colleges at Oxford and Cambrdge