In this section you will hear everything ONCE ONLY.
Listen carefully and then answer the questions that follow. Mark the correct
answer to each question on your coloured answer sheet.
People are likely to have a higher cholesterol level in winter because
A．they tend to take in less vitamin D in that season. B．they do less exercise and become weaker than usual. C．they need to eat much more greasy food to keep warm. D. they get less sun to convert cholesterol into vitamin D．