第二部分: 英语知识运用(共两节,满分35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,并在答题卡上将该项涂黑。
21. Hunger is _____ number one global health risk, so the WFP has organized a lot of programmes, which helps people most at ________risk.
A. the; /                  B. a; /               C. the;the            D. a;a 
22. --- Jimmy had a lot of parties recently.
--- Yes, that might         why he didn’t do well on the test.
A. sum up             B. push for              C. account for          D. compensate for