一个英语四级完形填空问题Furthermore,it is questionable whether ultimately nuclear power is a cheap ( ) of energy.A.source B.resource C.type D.category

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一个英语四级完形填空问题Furthermore,it is questionable whether ultimately nuclear power is a cheap ( ) of energy.A.source B.resource C.type D.category
一个英语四级完形填空问题
Furthermore,it is questionable whether ultimately nuclear power is a cheap ( ) of energy.
A.source B.resource C.type D.category

一个英语四级完形填空问题Furthermore,it is questionable whether ultimately nuclear power is a cheap ( ) of energy.A.source B.resource C.type D.category
A source 来源 翻译:并且,最终核能是否成为一种廉价的能源(能量来源)还存在疑问.