【山东省单县第二中学2012届高三下学期模拟】
21．President Hu's visit to Austria，______first by a Chinese president in 12 years，is regarded of _______great importance to global economic situation at present.
A．a：不填 B．the；a C．the；不填 D．the；the
【答案】
21．C 考察冠词，第一空序数词前加定冠词the，第二空be+of +n．= be+adj．
