2. 职称英语
  3. Even though the main source of ______ exposure for a majority of the human popul

Even though the main source of ______ exposure for a majority of the human popul

游客2023-12-27  58
问题 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.
选项 A、extra violent
B、extra violet
C、ultraviolet
D、ultravirus
答案 C
解析 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。
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