题目

 要除去铜粉中的少量铁粉，可加入下列试剂中的（    ） A．水              B．稀盐酸           C．硫酸亚铁          D．硝酸银溶液 答案：BCould you tell me______, Mr. Green?A. what is your family nameB. why the train hasn't arrived yetC. how can I get on well with my parents