问题补充：
On the annual International Volunteers Day, the world the work of millions of people who give their time to help others.
A. abolishes
B. accompanies
C. acknowledges
D. appeals
答案：
A. abolishes
B. accompanies
(答案→)C. acknowledges
D. appeals
解析：词义辨析. A.废除;废止 B陪同;陪伴 C.承认;答谢;报偿D.恳求.根据题意,在每年的国际志愿者日,世界各国都感谢亿万用自己时间去帮助别人的人所做的工作.选C.
