I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I—
I took the one less traveled by,
And that has made all the difference.
Questions:
A. Who is the author
B. What does "diverged" mean
C. What does the author try to tell us

对于以下反应：A（s）+3B（g）⇌2C（g）+D（g），在一定温度、压强下，在一体积可变的容器中，当下列物理量不再发生变化时就可确定一定达到平衡状态的是（　　）

A．容器的体积不再变化

B．B的生成速率和D的反应速率为3：1

C．混合气体的密度不随时间变化

D．B、C、D的分子数之比为3：2：1