反应：

PCl₅(g)PCl₃(g)＋Cl₂(g)①

2HI(g)H₂(g)＋I₂(g)②

2NO₂(g)N₂O₄(g)③

在一定条件下，达到化学平衡时，反应物的转化率均是a%。若保持各反应的温度和容器的体积都不改变，分别再加入一定量的各自的反应物，则转化率[ ]

A．均不变

B．①增大，②不变，③减少

C．均增大

D．①减少，②不变，③增大

---Would you please tell me _________? 

--- In a small village near Niingbo.

A．where was your mother born

B．where your mother was born

C．when was your mother born

D．when your mother was born