—You have to believe in yourself.No one else will，if you don't.

—________.Confidence is really important.

(2012·天津)

A．It's not my cup of tea

B．That's not the point

C．I don't think so

D．I couldn't agree more

（）阶段的任务是收集质量足够好的数据，以便用于后续的建模和分析工作，通常是大数据分析生命周期模型中最反复和耗时的阶段。

A.探索发现

B.数据准备

C.模型建造

D.项目实施