一、单项填空（共15小题，每小题1分，共15分）
1. In recent years ______ global warming is becoming ________ concern for people all over the world.
A. the; the B. \；\ C. \; a D. the; \
2. There was _______ time _______ Iraq was one of the strongest countries in the world.
A. a; when B. a; that C. the; that D. the; when
