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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

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。
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