After he became conscious, he remembered __________ and __________ on the head with s rod.

A．to attack; hit

B．to be attacked; to be hit

C．attacking; be hit

D．having been attacked; hit

“不登高山，不知天之高也；不临深渊，不知地之厚也。”强调了

A．实践是认识的来源

B．实践是认识发展的动力

C．实践是检验认识直理性的唯一标准

D．实践是认识的目的和归宿