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，并在答题纸 (卡) 上将该项涂黑。
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
23. Overpopulation is a terrible threat to the human race. Yet it is probably ____a threat to the
human race than environmental destruction.
A. no more B. not more C. even more D. little more
