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

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

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Themeninthewoodsdonotcallhomewiththetruth,though.Theysendpictures

Althoughfreetradeputsuncompetitivefirmsoutofbusiness,thedisplacedwork

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Althoughmanymodificationshavebeenmadeinit,thegameknownintheUnitedS

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WhenIfirstcametothiscountry,IthoughtlittlethatIshouldstayheresol

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Internationalairlineshaverediscoveredthebusinesstravelers,themanorwoma

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