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 World Health Organization gave a warning to the public without any ________when the virus of H1N1 hit Mexico in April , 2009.
      A.delay                         B.effort                               C.schedule                        D.consideration
22.According to news reports, personal________of guns in the USA causes a lot of trouble.
      A.wealth                       B.possession                        C.matter                          D.problem