题目内容：

下列除去杂质的方法中，正确的是

序号               物质                      所含杂质                       除杂方法

A                     CO                          CO₂                                  点燃

B                     NaCl                       泥沙                                溶解、过滤、蒸发

C                     CuO                       C                                     加适量的盐酸

D                     HCl                         H₂SO₄                              加适量的Ba(NO₃)₂溶液，过滤