二、英语知识运用（本题共2部分，共计45分）
第一节 单项选择（共15小题；每小题1分，满分15分）
21．Because of ______ high demand for Type AB blood, ______ supplies of it are usually limited．
A．the; the B．/; / C．/; the D．a; the
22. President Hu Jintao visited the museum of Xiaogang Village in Anhui in November, 2008．It was the first time that he _________ here .
A．came B．had come C．has come D．has been coming
23. The song You And Me _________ on the radio interests everyone.
A．playing B．played C．is played D．has been played
