Searching for (alternate) forms of energy does not (necessary) mean (the abandon

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问题 Searching for (alternate) forms of energy does not (necessary) mean (the abandonment) of fossil fuels as an energy (source).

选项 A、alternate
B、necessary
C、the abandonment
D、source

答案 B

解析

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Searchingfor(alternate)formsofenergydoesnot(necessary)mean(theabandon