单项填空
21.—The United States and South Korea began their military drills yesterday.
—Well, it bas become talk of world.
A. a; a B. the; 不填 C. the; the D.a; 不填
22. To spend the summer vacation, we may go to the mountains, or go to the seaside.
A. alternatively B. differently C. relatively D. oppositely
23. The moment we heard the news of the earthquake, we began to the work to rescue those who were trapped in the building.
