.More patients  ＿＿　in hospital this year than last year.

A．treated

B．have treated

C．had been treated

D．have been treated

我国城市工业职能分类，采取( )的方法。

A．多变量分析

B．统计分析

C．多变量分析和统计分析相结合

D．统计描述