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

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