【题目】Many scientists have believed that there may be a ______ of life on the Mars.
A.signalB.signC.markD.sigh
在线课程【答案】B
【解析】
考查名词辨析。句意：很多科学家相信在火星上有生命迹象。A. signal信号；B. sign标语，迹象；C. mark标记；D. sigh叹气。火星上的生命是有迹象的。故选B。
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