Questions 27 and 28. Choose TWO letters, A-E. 一个空填写一个选项,比如27&28答案为AB,在第一个空填写A, 第二个空填写B。 Which TWO things surprised the students about the traffic-light system for nutritional labels? A its widespread use B the fact that it is voluntary for supermarkets C how little research was done before its introduction D its unpopularity with food manufacturers E the way that certain colours are used Questions 29 and 30 Choose TWO letters, A-E. Which TWO things are true about the participants in the study on the traffic-light system? A they had low literacy levels. B they were regular consumers of packaged food. C they were selected randomly. D they were from all socio-economic groups. E they were interviewed face-to-face.