Many scientists have believed that there...

Many scientists have believed that there may be a _________of life on the Mar．

A．mark

B．signal

C．sigh

D．sign

D 【解析】试题分析：考查名词辨析：A. mark记号，B. signal信号，C. sigh叹息，D. sign标志，迹象，句意是：很多科学家一致相信在火星上可能有生命的迹象。选D。考点：考查名词辨析

考点分析：

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