问题补充：
How many countries the European Union made up of, do you know?
A. is
B. are
C. have
D. has
答案：
(答案→)A. is
B. are
C. have
D. has
解析：答案：A考查主谓一致。分析句子结构可知，专有名词the European Union是句子的主语，谓语动词应用单数形式。由此结合固定短语be made up of可排除C、D两项，空格处应用is。故答案选A。
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