2. 外语
  3. In recent years, researches have suggested more health value from vitamin D than had once been thought. Vitamin D is【C1】___

In recent years, researches have suggested more health value from vitamin D than had once been thought. Vitamin D is【C1】___

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问题      In recent years, researches have suggested more health value from vitamin D than had once been thought.
     Vitamin D is【C1】______ naturally in the blood. Sunlight is a【C2】______ source. It is also found in some foods. Vitamin D helps to increase levels of calcium in the blood. It helps build strong bones and teeth.
     It also【C3】______ to do more than just protect against rickets (软骨病). That serious bone disease was the reason why vitamin D was added to milk. Rickets is now【C4】 ______ in the western world. But it is still a common childhood disease in developing countries. Rickets can and is also【C5】______ to cause bone pain and weakness, teeth problems and muscle【C6】______  
     According to the study by the Harvard School of Public Health, Vitamin D might protect against multiple sclerosis (硬化症), also called MS.
     MS is a【C7】______ disease of the central nervous system that【C8】______ about two million people around the world. There is no【C9】______ . The level of severity can differ from person to person. But is usually seriously disabling.
     The study iii Boston found that people with higher levels of vitamin D had lower【C10】______  of MS. It found that the chance of developing MS was sixty-two percent lower among those with the highest level of vitamin D【C11】______ those with the lowest level.
     Vitamin D may become a future【C12】______ for MS. But, he says first scientists must carry【C13】______ a large, controlled study in which some people get vitamin D and others【C14】______ not.
     This is not the first study to show a possible【C15】______ between vitamin D and multiple sclerosis. But it has【C17】______ the clearest evidence of a direct【C16】______ . The National Institutes of Health says some studies also suggest vitamin D【C18】______ protect against some kinds of【C19】______  . But it says more human studies are needed to learn if a lack of vitamin D【C20】______  the risk of cancer.  
【C18】
选项 A、may
B、should
C、can
D、must
答案A
解析 情态动词辨义题。该空的答题点在于后文“but it says more human studies are needed．．．”，故对于维他命D能否抵抗癌症，作者的态度不该是完全肯定的。因此应选择A may“可能”。
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