【题目】Many people like white colour as it is a ____ of purity.
A.symbol
B.sign
C.signal
D.mark

【答案】A
【解析】Symbol“象征”；sign“征兆，迹象”；signal“信号”；mark“痕迹”。句意：许多人喜欢白色因为它是纯洁的象征。故选A。