城市是（）发展到一定阶段的产物。
A.社会生产力
B.社会生产关系
C.阶级
D.阶级斗争
参考答案：A
--- Would you mind my opening the window?
---
A．I would
B．I’m afraid it’s too windy
C．Yes, please go ahead.
D．Sure. I’m going to close it soon.
