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

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