2014-12-CET4-LISTENING-SECTIONB.mp3: PassageOne Questions 16 to 18 are based on the conversation you have just heard. 16. A) Nodding one's head. B) Waving one's hand. C) Holding up the forefinger. D) Turning the right thumb down. 17. A) Looking away from them. B) Forming a circle with fingers. C) Bowing one's head to them. D) Waving or pointing to them. 18. A) Looking one's superior in the eye. B) Keeping one's arms folded while talking. C) Showing the sole of one's foot to a guest. D) Using a lot of gestures during a conversation. Passage Two Questions 19 to 21 are based on the passage you have just heard. 19. A) They had to beg for food after the harvest. B) They grew wheat and corn on a small farm. C) They shared a small flat with their relatives. D) The children walked to school on dirt roads. 20. A) Tour Ecuador's Andes Mountains. B) Earn an animal income of $2,800. C) Purchase a plot to build a home on. D) Send their children to school. 21. A) The achievements of the Trickle Up Program. B) A new worldwide economic revolution. C) Different forms of assistance to the needy. D) The life of poor people in developing countries. Passage Three Questions 22 to 25 are based on the passage you have just heard. 22. A) They are highly sensitive to cold. B) They are vitally important to our life. C) They are a living part of our body. D) They are a chief source of our pain. 23. A) It has to be removed in time by a dentist. B) It is a rare oral disease among old people. C) It contains many nerves and blood vessels. D) It is a sticky and colorless film on the teeth. 24. A) It can change into acids causing damage to their outer covering. B) It greatly reduces their resistance to the attacks of bacteria. C) It makes their nerves and blood vessels more sensitive to acid food. D) It combines with food particles to form a film on their surface. 25. A) Food particles. B) Gum disease. C) Unhealthy living habits. D) Chemical erosion.