题目内容：
WhichisNOTtheadvantageofthenuclearstations?
A．Thenuclearstationsaresaferthanthecoal-firedstations． B．Thecostofbuildingthenuclearstationsismorethanthatofthecoal-firedstations．
C．Thecheaperrunningofthenuclear'stationscanoffsetitsgreatconstruction．
D．Thenuclearstationsaremuchcleanerthantheconventionalones．
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答案解析：