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)
21. While income worry is _______ rather common problem of the aged, loneliness is another problem that ________ aged parents may face.
A. a; 不填 B. the; 不填 C. a; the D. the; the
22. Ladies and gentlemen, welcome to my program. ____ me this evening is Dr. Gray.
A. To join B. Join C. Joined D. Joining
