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Some solid evidence proves that water really exists on Mars, but unfortunately, there is still no of life.

AmarkBsignCsymbolDsignal

 

B

【解析】

試題分析:考查名詞。A標記;B跡象;C象征;D信號。句意:有確鑿的證據證明火星上存在水,但不幸的是,仍然沒有生命的跡象。故B正確。

考點:考查名詞

 

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