The ozone layer (must be protected) because (it) shields the Earth (from) excess

游客2025-05-11 9

问题 The ozone layer (must be protected) because (it) shields the Earth (from) excessive ultra-vilolet (radiations).

选项 A、must protected
B、it
C、from
D、radiations

答案 D改为radiation

解析 radiation辐射，放射，是不可数名词。

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