火法精炼锡采用（ ）方法除掉杂质。
A．溶折
B．熔折
C．解析
D．凝析
E．气析
参考答案：B,D
As to his criticism, I don’t mind it in the least, but______is how he does it that I can’t take.
A．which
B．that
C．this
D．it
同质分组
