C.vitamin D makes one’s skin look young and healthy
D.vitamin D may help to slow the ageing process
【小题2】From Brent Richards, we know that _____.
A.sunlight causes skin cancer to people with high level of vitamin D
B.the study generally has a healthy effect on the general ageing process
C.vitamin D can only be got from fish, eggs and breakfast cereals
D.the higher levels of vitamin D people have, the more slowly people may age
【小题3】What can we infer from the passage? A. Telomeres are important signs of ageing of the DNA. B. Sunlight can be dangerous as it causes skin cancer. C. Sunlight does a great deal of good to our health. D. Vitamin D can also be gained from food. 【小题4】 What is the best title of the passage?