题目内容：
请在（2）处填写正确答案。
A．And he added jokingly that US (actually it was the short form for the United States stood for Uncle Sam Wilson.) B．However, not many people have ever heard of such a man. Not even most young Americans.
C．He did his bit to support the American army.
D．In 1961 the US Congress(国会) made a decision that “Uncle Sam” is the America's national symbol.
E．On October 2 that year, a group of visitors came to Sam's meat-packing plant.
F．Since Uncle Sam was an example of a hard-working man and a lover of America, the idea of “Uncle Sam” as the name for this kind of man became well-known rapidly.
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