Questions 23-30
· You will hear people from the National Food Council complaining to retailers about the high prices they are charging for food products and household goods. They complain that the shops have marked up wholesale prices far too much.
· For each question (23-30), mark one letter (A, B or C) for the correct answer.
· After you have listened once, replay the recording.

Another person argues that prices should be increased because of A. the large number of surveys being carried out. B. the improved services in shops. C. the higher quality of food now being sold.

换氢气钢瓶应注意什么？