【四六级考试网 - 大学英语四六级考试(CET)试题】：
12. A) By prediction. B) By recording.

 

　　C) By observation. D) By examination.

　　13. A) To observe people's attitude towards strangers.

　　B) To see how people get along with their friends.

　　C) To test people's behaviour in social life.

　　D) To find out how shy people are.

　　Passage Two

　　Questions 14 to 17 are based on the passage you have just heard.

　　14. A) A housewife. B) A singer. C) A teacher; D) A musician.

　　15. A) The violin was too expensive.

　　B) She was too young to play the violin.

　　C) The violin was too big for her.

　　D) Her mother wanted her to play the piano.

　　16. A) To play the violin once again. B) To go to the United States.

　　C) To accept a full scholarship. D) To make a tape recording.

　　17. A) To live a more comfortable life. B) To give performances.

　　C) To be a pupil of a famous violinist. D) To enter a famous university.

　　Passage Three

　　Questions 18 to 20 are based on the passage you have just heard.

　　18. A) Because they have had little exposure to high level of sounds.

　　B) Because they suffer from hearing loss.

　　C) Because they don't know how to operate stereo systems.

　　D) Because they are not sound engineers.

　　19. A) A year ago. B) A decade ago.

　　C) Three years ago. D) Five years ago.

　　20. A) Providing a warning light when the sound is too loud.

　　B) Producing more personal stereo systems.

　　C) Restricting the use of personal stereos.

　　D) Setting up a standardized hearing test.