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

    A．markB．signC．symbolD．signal

    B

    解析试题分析：考查名词。A标记；B迹象；C象征；D信号。句意：有确凿的证据证明火星上存在水，但不幸的是，仍然没有生命的迹象。故B正确。
    考点：考查名词

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