—Learning a language isn't easy. It takes time.
—I agree.（）. There's no shortcut.

A. All roads lead to Rome

B. Rome wasn't built in a day

C. Practice makes perfect

D. Slow but sure wins the race

在数据管理技术发展的三个阶段中，数据共享最好的是（）。

A.人工管理阶段

B.文件系统阶段

C.数据库系统阶段

D.三个阶段相同