Ⅰ.单项选择题：阅读下列各题，从题后所给的A、B、C、D四个选项中选择一个最佳答案。(20小题，每小题1分，共20分)注意：要将答案填在题后的第I卷答题处噢！
( ) 1. There's _________800-metre-long road behind _________hospital.
A. an, an B. a, a C. an, the D. a, the
( ) 2. The population of the world ____ still ____ now.
A. has; grown B .is; growing C. will; grow D. is; grown
