Nowadays,  there is a  ____ increase in children's creativity, for they are greatlyencouraged to develop their talents.      [ ]

A. sharp        

B. slight        

C. natural      

D. modest

下列不能作为财产保险标的的是（）。

A．环境责任

B．出口信用

C．收入补偿

D．忠诚保证