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    【题目】 As a matter of fact, scientists discovered no ______ of life in the Mars.

    A. signal B. mark C. sign D. symbol

    【答案】C

    【解析】

    试题分析：考查名词。A. signal信号；B. mark标记；C. sign迹象；D. symbol象征，符号。事实上，科学家们发现在火星上没有生命的迹象。故选C。

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