问题
单项选择题
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
答案
参考答案：C
解析：形近识别。ultraviolet紫外线的：ultraviolet light紫外线光。extra violent特别猛烈的；extra violet特别的紫罗兰；ultravirus超显微病毒。