Who is taking care of your father? I heard he is in hospital now.

A．looking like

B．taking part in

C．looking up

D．looking after

在人类社会漫长的发展历程中（）被称作支撑人类文明和进步的“三大支柱”。

A、物质资源

B、能源资源

C、信息资源

D、人力资源