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【单选题】

Even though the main source of______exposure for a majority of the human population is the sun, the artificial tanning from sun beds contributes significantly to the total UV risk.
A.extra violent

B.extra violet
C.ultraviolet
D.ultravirus
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根据网考网移动考试中心的统计,该试题:

0%的考友选择了A选项

3%的考友选择了B选项

89%的考友选择了C选项

8%的考友选择了D选项

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