题目

下列化学方程式书写正确的是（   ）A．S + 2OSO2 B．KClO3==KCl + O2↑C．2H2 + O22H2O D．Mg + O2MgO2 答案：C解析:略In a modern society full of fierce competitions, _______a person does is not always the same as _____he says.A.that; that B.that; whatC.what; what D.what; that