On April 24th, 2011, Hu Jintao, chairman of the P．R.C., and other state leaders attended Tsinghua centennial (百年的) celebration at Great Hall of the People in Beijing.
A./；/ B./；the
C．the; the D.the; /
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解析：答案：B。考查冠词。第一空chairman是表示职务、头衔的名词，在充当句子的主语补足语、宾语补足语或者同位语时，应该不加冠词；第二空是由普通名词构成的专有名词，应该用定冠词。