-Who got the first prize in the English competition yesterday?

-A boy __________ spoken English is very good.[ ]

A. that

B. whose

C. which

D. who

建立在清楚的逻辑基础上，并且它的决策方法和决策过程有固定的规律可循，可事先规定明确的决策规则的决策是( )。

A．非结构化决策

B．不可编程序决策

C．半结构化决策

D．结构化决策