一切真知都发源于:

A、<span style="font-size:16px;font-family:宋体">直接经验</span>

B、<span style="font-size:16px;font-family:宋体">间接经验</span>

C、<span style="font-size:16px;font-family:宋体">客观事物</span>

D、<span style="font-size:16px;line-height:150%;font-family:宋体">人的意识</span>