【单选题】
VitaminD、is {{U}} (62) {{/U}} naturally in the blooD、Sunlight is a {{U}} (63) {{/U}} source. It is also found in some foods. VitaminD、helps to increase levels of calcium in the blooD、It helps build strong bones and teeth.
It also {{U}} (64) {{/U}} to do more than just protect against rickets (软骨病). That serious bone disease was the reason why vitaminD、was added to milk. Rickets is now {{U}} (65) {{/U}} in the western worlD、But it is still a common childhood disease in developing countries. Rickets can and is also {{U}} (66) {{/U}} to cause bone pain and weakness, teeth problems and muscle {{U}} (67) {{/U}}
According to the study by the Harvard School of Public Health, VitaminD、might protect against multiple sclerosis (硬化症), also called MS.
MS is a {{U}} (68) {{/U}} disease of the central nervous system that {{U}} (69) {{/U}} about two million people around the worlD、There is no {{U}} (70) {{/U}}. The level of severity can differ from person to person.But is usually seriously disabling.
The study iiiBoston found that people with higher levels of vitaminD、had lower {{U}} (71) {{/U}} of MS. It found that the chance of developing MS was sixty-two percent lower among those with the highest level of vitaminD、{{U}} (72) {{/U}} those with the lowest level.
VitaminD、may become a future {{U}} (73) {{/U}} for MS.But, he says first scientists must carry {{U}} (74) {{/U}} a large, controlled study in which some people get vitaminD、and others {{U}} (75) {{/U}} not.
This is not the first study to show a possible {{U}} (76) {{/U}} between vitaminD、and multiple sclerosis.But it has {{U}} (77) {{/U}} the clearest evidence of a direct {{U}} (78) {{/U}}. The National Institutes of Health says some studies also suggest vitaminD、{{U}} (79) {{/U}} protect against some kinds of {{U}} (80) {{/U}}.But it says more human studies are needed to learn if a lack of vitaminD、{{U}} (81) {{/U}} the risk of cancer.
B．touch
C．contact
D．link
网考网参考答案：D
网考网解析：
[精解] 名词辨义题。此处需要一个表示维他命D与硬化症之间“关联”的词。link意为“环节，联系”，故本题答案为D)。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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