“能为他人解决困难和痛苦，我认为这是人生的最大幸福。”这说明 [ ]

A．人生的价值在于索取 

B．奉献使人快乐，使人充实，使人高尚 

C．人生的价值在于金钱的多少 

D．人生的价值在于创造 

The young soldier really doesn't know _______ to stop the baby from crying. [ ]

A. what to do

B. how to do

C. when to do

D. where to do