【題目】Many scientists have believed that there may be a ______ of life on the Mars.

A.signalB.signC.markD.sigh

【答案】B

【解析】

考查名詞辨析。句意:很多科學(xué)家相信在火星上有生命跡象。A. signal信號(hào);B. sign標(biāo)語(yǔ),跡象;C. mark標(biāo)記;D. sigh嘆氣;鹦巧系纳怯雄E象的。故選B。

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