13.
A. Its rapid growth is beneficial to the world.
B. It can be seen as a model by the rest of the world.
C. Its success can't be explained by elementary economics.
D. It will continue to surge forward in the future.
14.
A. It takes only 5 minutes to reach the campus from the apartments.
B. Most students can't afford to live in the new apartments.
C. The new apartments are not available until next month.
D. The new apartments can accommodate 500 students.
