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. Bill Clinton said during his two terms as president America had moved out of _______ industrial economy into ______ information age.
A. an; an B. the; an C. an; the D. 不填; 不填
22. —Which of these two books will you take？
—I’ll take ______, in case the journey is boring.
A. either B. both C. all D. neither
