He said ______ couldn’t he work out the problem but his teacher didn’t know how to do it.

A.though                      B.never                        C.hardly                       D.not only

D


解析:

如果選用B項或C項，題干中不能使用not，故排除。正確答案是D。

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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 King's 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 KCL's twin research unit, and a co-author of the report, added: "Although it might sound absurd(荒謬的), it's possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process."

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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 food                 D．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.

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