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.  
【C4】
选项 A、common
B、popular
C、rare
D、usual
答案C
解析 形容词辨义题。该空的信息点在后文“but it is still a common childhood disease in developing countries。”所以可推断该句应该与后句形成对比，即“软骨病目前在西方发达国家已不多见。”故选C 。
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