___________man can create radioactive elements, there is nothing he can do to reduce radioactivity.A.AsB.WhetherC.WhileD.Now that
___________man can create radioactive elements, there is nothing he can do to reduce radioactivity.
A.As
B.Whether
C.While
D.Now that
B.Whether
C.While
D.Now that
参考解析
解析：考查连词辨析。前半句意思是“人类能够创造放射性元素”，后半句意思是“人类没办法减少辐射”，两句话意思之间存在转折或让步关系。as可引导让步状语从句，表示“虽然，尽管”，但要用部分倒装结构。whether引导让步状语从句时，通常与or连用，意为“不管……还是……”。while作“尽管，虽然”讲时可引导让步状语从句，有着强烈的对比意味。now that意为“既然；由于”，用来引导条件状语从句。故C项符合题意。
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