54.There are two major problems linked with nuclear power plants, the first concerns nucleawaste.

A. of which

B. of the two

C. of them

D. of the plants

正确答案：A

解析：

54.【翻译】有两个主要问题与核电站相关，其中第一个就是核废料。【精析】A分析句子结构可知，逗号后面是一个非限制性定语从句：结合选项可知，只有of which符合题意，关系代词which指代主句中的two major problemso B、C、D三项均不能引导从句。故选A ■

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