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)
请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
21. ______ World Food Programme has organized a number of programmes, which target people most at ______ risk and people stand at ______ crossroads, such as babies, pregnant women and ______ elderly.
A. /; the; the; / B. The; /; the; the C. The;/; the; / D. /; /; a; the
