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Every few years, the coal workers                 their lungs X-rayed to ensure their health.


  1. A.
    are having
  2. B.
    have
  3. C.
    have had
  4. D.
    had had
B
解析:
考查时态。根据Every few years可知句子谓语要用一般现在时态。所以选B。
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Mr. Harrison has been giving blood every few weeks since he was 18 years old and has now racked up a total of 984 donations. When he started donating, his blood was deemed so special that his life was insured for one million Australian dollars.

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Mr. Harrison is Rh-negative and was given injections of Rh-positive blood. It was found his plasma could treat the condition and since then it has been given to hundreds of thousands of women. It has also been given to babies after they are born to stop them developing the disease.

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A. 56           B. 70           C. 74           D. 78

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    B. he has a golden arm worth a million dollars

    C. a vaccine called Anti-D is to be developed

    D. someone else’s blood saved his life

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    B. the mother and the baby have different types of blood

    C. Rhesus disease contributes to permanent brain damage

    D. all the patients have a rare antibody in their blood

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    A. Some of the tests to develop the vaccine are dangerous.

    B. His wife Barbara needed to be taken care of badly then.

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