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

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

admin2008-10-11  43
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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