对于反应①KHCO₃溶液与石灰水反应，②Na₂SO₃溶液与盐酸反应、③Si与烧碱溶液反应、④Fe与稀硝酸反应，改变反应物的用量，不能用同一个离子方程式表示的是 （ ）

A．①②③

B．①②④

C．①③④

D．②③④

________ the teachers is about 300 in our school and it is becoming_____________.

A．The number of, more and more

B．The number of, bigger and bigger

C．A number of, more and more

D．A number of, bigger and bigger