The children, ________ had played the whole day long, were worn out.

A．all of what

B．all of which

C．all of them

D．all of whom

根据自己的生物钟安排学习活动属于学习策略的（ ）。

A．资源管理策略

B．元认知策略

C．组织策略

D．认知策略