—_______ you have bought for me! —I got them in the biggest market.

A．What a big fish

B．How a big fish

C．What big fish.

D．How big fish

下列哪项不属统计学常用基本概念（）

A.总体与样本

B.个别与一般

C.参数与统计量

D.抽样误差

E.概率