专四
A.sign
B.mark
C.signal
D.board
【解析】名词含义。A.sign“标记,记号,征兆”,尤指标准化的、复杂的或记号的形状本身带有指向意义的符号,还可以指手势。在这句话里,指“路标”这种标准化且带有形状含义的标记,符合题意。B.mark“标志。痕迹,记号”,主要用来指能给予清楚的指示意义的符号,如:a question mark。C.signal“信号”.通常指特定情况下对有关人员发出的声音或行为,如:A red light is usually a signal of danger.(红灯通常是危险的信号。) D.board“(供特殊用途的)木板”,不带有“路标”或“标记”的含义。
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