By the time Jack returned home from America, his son _______ from college.


  1. A.
    graduate
  2. B.
    has graduated
  3. C.
    had graduated
  4. D.
    had been graduated
C
考查時(shí)態(tài)。By與完成時(shí)連用，本題by后面是表示過去的時(shí)間，所以使用過去完成時(shí)。句意：到JACK回到美國(guó)的時(shí)候，他兒子已經(jīng)大學(xué)畢業(yè)了。
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科目：高中英語 來源：黑龍江省哈師大附中09-10學(xué)年高二4月月考（英語） 題型：閱讀理解

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B．To get back their football.
C．To swim in the open water.
D．To test the umbrella as a sail.
【小題2】What does "it” in Paragraph 2 refer to?
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D．To ask the boys to take down the umbrella.
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C．They were washed to the pier by the waves.
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【小題4】 What is the best title of the passage?
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B．he taught the country people simple facts about medicine in California.

C．a(chǎn)fter the war, he married the old doctors’ daughter.

D．Tim worked as a life-saver after war.

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B．was not afraid of blood.

C．decided to give up his doctor career.

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C．Tim’s marriage

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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."

Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the body's 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.

1.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.

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A.through water.       B. through sunshine.

C.through food.        D.both B and C.

3.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.

 

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