问题补充：
A healthy dose of sunshine may be the secret to staying young, British scientists have disclosed.
Vitamin D is produced naturally by the skin in response to sunlight and may help to slow the ageing process and protect against heart disease, according to the study.
Researchers from Kings College London studied 2,160 women aged between 18 and 79, looking at their telomeres - a biological marker of ageing found in DNA．As people get older, their telomeres get shorter and they are easy to have illnesses.
But the study found women with high levels of vitamin D had comparatively longer telomeres - a sign of being biologically younger and healthier.
The study suggests vitamin D may help to slow down the ageing process of DNA, and therefore the ageing process as a whole.
Lead researcher Dr Brent Richards said: These results are exciting because they prove for the first time that people who have higher levels of vitamin D may age more slowly than people with lower levels of vitamin D．
This could help to explain how vitamin D has a protective effect on many ageing related diseases, such as heart disease and cancer.
He said further studies are required to confirm the findings.
Professor Tim Spector, head of KCLs twin research unit, and a co-author of the report, added: Although it might sound absurd(荒谬的), its possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process.
Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the bodys supply, but lower levels can also be obtained through food such as fish, eggs and breakfast cereals.
Other studies have suggested the vitamin plays a key role in protecting against cancer and heart disease.
64．What’s the best title of this passage?
A．Sunshine helps to keep you young
B．Vitamin D has a protective effect on many diseases
C．Telomeres - a biological marker of ageing
D．People have found the secret to having a long life
65．How can people get vitamin D?
A．through water B．through sunshine
C．through foodD．both B and C
66．What does the underlined word in paragraph three refer to?
A．It refers to a kind of vitamin that can keep you young.
B．It refers to a biological marker of ageing found in DNA.
C．It refers to a kind of element that can be obtained from sunshine.
D．It refers to a part of the body.
67．Which of the following is not true according to the passage?
A．women with high levels of vitamin D shows a sign of being biologically younger and healthier.
B．vitamin D has a protective effect on many ageing related diseases.
C．too much sunshine may increase our risk of skin cancer.
D．It has been proved that sunshine helps to keep you young.64-67 ADBD
答案：
(答案→)64-67 ADBD
解析：英国科学家日前公布，长期坚持晒太阳可能是永葆青春的秘诀。
64．主旨大意题。根据文章第一段主题段可以看出，长期坚持晒太阳可能是你永葆青春的秘诀。
65．细节理解题。根据倒数第二段Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the bodys supply, but lower levels can also be obtained through food such as fish, eggs and breakfast cereals.可以看出，维生素D主要通过日晒获得，也可通过食物获得。
66．词意理解题。根据第三段第二行：looking at their telomeres - a biological marker of ageing found in DNA.可以看出，telomeres，是位于染色体末端的DNA微粒。
67．细节判断题。根据倒数第四段He said further studies are required to confirm the findings.可以看出，还需要进一步的研究证实这项发现。
