As is well known to us all, in China pigeons stand for peace. However, in India the wheel in its national flag is also a of peace.
A. symbol
B. sign
C. mark
D. example
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(答案→)A. symbol
B. sign
C. mark
D. example
解析：句意为: 众所周知在中国鸽子代表和平, 而在印度国旗上的车轮也是和平的象征。
symbol 意思为 “象征;符号”，故D项符合题意。sign 记号；符号；标牌；征兆；mark记号；符号；标记；痕迹；example 例子；样本；范例；榜样。