问题详情

According to this passage, which of the following statements is true？
A．To avoid decay and deterioration, we must keep the world permanently stable.
B．The world is always changing, so we must adjust ourselves to new conditions.
C．The important point of evolution is that the world undergoes movement forward and movement backward alternately.
D．Tradition often become an obstacle lying across the path of change and progress.请帮忙给出正确答案和分析，谢谢！