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

A．markB．signC．symbolD．signal

 

B

【解析】

試題分析：考查名詞。A標(biāo)記；B跡象；C象征；D信號(hào)。句意：有確鑿的證據(jù)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(diǎn)：考查名詞

 

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