下列哪种气体对热辐射线是透明的，既不吸热也不辐射热（）。
A.CO2
B.H2O
C.CO
D.SO2
参考答案：C
The banker was found in a remote village after ____ his office last Thursday. [ ]
A. leave
B. being left
C. leaving
D. having been left
间接营销渠道的具体方法有( )。
A．保险人销售与保险代理人销售 B．保险代理人销售与保险公估人销售C．保险代理人销售与网络销售 D．保险代理人销售和保险经纪人销售
