A．The role of China in the spread of the national flag.B．The second ancestor of the na
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A．The role of China in the spread of the national flag.
B．The second ancestor of the national flag.
C．The use of modern flags in Europe.
D．The importance of modern flags.
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正确答案：B
解析：短文开头提到Historians believe that it had two major ancestors, of which the earlier served to show wind direction，下文都是针对“风向。”进行的描述。因此推断下文应该讲述national flags的第二个起源，故选B项。