【題目】 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】

試題分析：考查名詞。A. signal信號(hào)；B. mark標(biāo)記；C. sign跡象；D. symbol象征，符號(hào)。事實(shí)上，科學(xué)家們發(fā)現(xiàn)在火星上沒有生命的跡象。故選C。

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