(2009山东滨州一模)Obama has been elected first black president of the United States, and the international society expects to have new USA under his leadership.
A 不填；the B a; the C. the ; a D the ; the
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解析：序数词必须与定冠词the连用，表示顺序，所以第一空用the；表示地名或姓名的专有名词前有形容词修饰时，其转化为普通名词，这是要用不定冠词来限定。