(2013·合肥一检)According to the rules and regulations, all payments ________ be made in cash in the shopping center.

A．shall　

B．can

C．must　

D．should

下列化学方程式符合题意并书写正确的是（　　）

A．实验室制取氧气2KClO₃═2KCl+3O₂↑

B．铁跟稀硫酸反应制取氢气2Fe+3H₂SO₄=Fe₂（SO₄）₃+3H₂↑

C．镁在氧气中燃烧2Mg+O₂

D．氢氧化镁和硝酸反应Mg（OH）₂+HNO₃=Mg（NO₃）₂+2H₂O