题目

下列除去杂质的方法正确的是               （     ）A．除去CO2中的少量HCl：通入NaOH溶液B．除去NaOH溶液中的少量MgCl2：加入适量KOH溶液，过滤C．除去KCl溶液中的少量K2CO3：加入适量的盐酸D．除去N2中的少量O2：通过灼热的CuO粉末  答案：C解析:略 14. The chart suggests that there huge growth in employment,so I suggest you every effort to prepare yourself before getting a job.   A. is;make   B. be;would make    C. is;should have made   D. should be;make