242. Even their most ardent champions concede that no less than a technical or scientific breakthrough is necessary before solar cells can meet the goal of providing one percent of the nation’s energy needs.

(A) that no less than a technical or scientific breakthrough is necessary

(B) that nothing other than a technical or scientific breakthrough is needed

(C) that a technical or scientific breakthrough is necessary

(D) the necessity for an occurrence of a technical or scientific breakthrough

(E) the necessity for a technical or scientific breakthrough occurring

ans: （C）

我的问题是我不明白题干的意思，实在是不好意思，人家都讨论到这么高深的问题了，我还在。。。

麻烦那位精确翻译一下，我像这样我才能更好的判断A是否在内容上冗余！

谢谢了！：）

即使最热心的拥护者也得承认至少得有一个技术或科学上的突破才能满足使太阳能电池提供整个国家能源的百分之一。

solar cells太阳能电池。