Russian women had to wear protective masks as they walked in Moscow, which was ______ by a heavy smog yesterday.

A．shrouded

B．unveiled

C．decayed

D．deprived

（）描绘了“老吾老以及人之老，幼吾幼以及人之幼”的社会状态。

A、孔子

B、老子

C、荀子

D、孟子