第二部分:英语知识运用(共两节,满分45分)
第一节 单项填空(共15小题;每小题1分,满分15分)
从A、B、C、D四个选项中,选出可以填入空白处的最佳选项。 
21.The financial crisis has put the world economy in a difficult________.
      A. occasion                 B. condition                      C. evaluation                    D. situation
22.My uncle and aunt work on the farm, ________they raise fifty________.
      A. there; cattle            B. where; head of cattle     C. in which; head of cattle  D. where; cattles
23.Daqing experienced ________heaviest rainfall in ________month of June.
      A./;a                          B. a; the                           C. the; the                        D. the; a